Ask Foghorn: 6.8 SPC versus 300 BLK?

Reader Erik writes:

I’ve been reading many articles re. defensive rifles/ammo and it seems I’ve noticed your fondness for the .300 BLK round.  I am impressed as well but the overall lack of its use and the increased cost/round concern me.  I know that round for round 6.8 SPC ammo is about the same right now, but given the increased popularity of the 6.8 with many military agencies, I am betting that over time the round will become more available (just like the 5.56 is now) and will become less expensive. Would appreciate your thoughts on this.

I get this a lot, actually. And its a valid question — what makes 300 BLK so much better than the other calibers available for the AR platform? And is it actually better? So here’s the truth…

It depends on what you want to do.

I’m going to break this into three categories, encompassing everything a shooter should consider when choosing a caliber: performance, compatibility and availability.

PERFORMANCE

The 6.8 SPC and 300 BLK cartridges were designed for two very different jobs. 6.8 SPC was designed to be a longer range cartridge, while 300 BLK was designed to be a shorter range cartridge that worked well with a silencer. I interviewed Kevin Brittingham, founder of AAC (and godfather of the 300 BLK cartridge) and he had this to say about his round:

These were our original requirements for this caliber: Muzzle energy has to equal or exceed the AK-47. .30 Caliber projectile. Use unmodified 30 round magazines to full capacity. Use unmodified AR-15/M-16/M-4 bolt. Gas impingement system. Shoot super and subsonic. And one thing that was nice, but was not a ‘deal killer’, was non-adjustable gas system. Cycle all four ways – subsonic suppressed and unsuppressed, and supersonic suppressed and unsuppressed.

[...]

It’s not one of the 6.5 or 6.8 or whatever is the flavor of the month where it’s a do-all, kick-ass… From a military standpoint, here is the advantage (which we discussed earlier): all we need is to change the barrel and get the ammo. Non-adjustable gas system… And that’s a huge thing. Nobody works with silencers more than us. Every time I’m working with a company on something, whether it’s LWRC or Colt or FN, whatever it is, if it’s got an adjustable gas system we get halfway through the test and we’re like “holy shit, we didn’t adjust the gas system.” It’s not something that’s really intuitive, you gotta think about having a suppressed system or unsuppressed. If you can get away with a non-adjustable it’s always best. And we’re able to achieve that, and it’s because we did the whole gun; we did the ammo and the silencer so it all works together.

So, 300 BLK was designed to fill a specific role. It was designed to be a big, heavy round that can be quickly changed from subsonic to supersonic and suppressed easily.

6.8 SPC, on the other hand, was never intended to be quiet. The relatively small projectile was designed to add a little more mass to the round while maintaining that zippy velocity that gives 5.56 ammo its punch. And thanks to that extra velocity, the 6.8 SPC does indeed perform better at longer distances.

Out at 500 yards, 300 BLK drops a whole extra 30 inches compared to 6.8. But to 200 yards, the difference is less than two inches.

That higher velocity also means that the 6.8 cartridge has a higher muzzle energy than the 300 BLK, clocking in at about 1,694 foot pounds for the 115gr variant to 300 BLK’s 1,360 for their 125gr offering. And the 6.8 SPC’s performance only improves with added weight. (By the way, 5.56 NATO 55gr comes in at 1,188 foot pounds.)

So, in short, if you really want the most muzzle energy and long distance performance then 6.8 is the way to go. Actually .338 LM is the way to go, but that won’t fit into an AR-15 magazine.

COMPATIBILITY

To me, the entire point of having a funky caliber in the AR-15 platform is to be able to switch quickly and seamlessly from one caliber to the other. I should be able to swap uppers and be good to go. And, in general, that’s possible with both calibers. But one caliber really does it better.

The 6.8 SPC cartridge is designed from the .30 Remington cartridge, meaning that it will not work with a standard AR-15 bolt. You need a slightly larger bolt, which means less material on the bolt face to contain the force of the escaping gasses and a higher probability of failure (less material + higher muzzle energy…). And when it fails, you’ll need one of your special snowflake bolts instead of any old standard AR-15 bolt.

Speaking of special snowflake parts, while the 6.8 SPC will fit in an AR-15 magazine, its actually too fat to work at full capacity. Most manufacturers appear to warn users to only load five or six rounds to avoid bulging the magazine. Magpul is coming out with a new magazine specifically designed for 6.8 soon, but the rumors are that it will only work in LWRC’s special purpose-built 6.8 lower receiver and not standard ARs.

The headache doesn’t stop there, though. There are, by my count, four incarnations of the 6.8 caliber. One is the SAAMI spec, which is a lower pressure load. Then there’s SPC II and 6.8×43, both of which have different chamber pressure ratings. And finally there’s Noveske’s Mod1 design, which apparently allows the highest pressures and best performance — but its proprietary, and not cheap. In short, you need to double check that you’re buying the caliber you want before you drop the coin on that new upper, and ensure that you’re getting the right ammo.

300 Blackout is much simpler. There is only one flavor, which is an open and freely available SAAMI spec that is already rated to a higher chamber pressure than its wildcat predecessor (the 300 Whisper). Which means that if you get a 300 BLK barrel from any manufacturer you can rest assured that its going to take any 300 BLK ammo you throw at it and more.

300 BLK also removes a lot of the equipment headaches. Since it is made directly from 5.56 brass and was designed specifically to work in standard AR-15 magazines, it works flawlessly with standard AR-15 bolts and magazines. There are no issues with feeding, no issues with magazine capacity, and spare parts are abundant since the only real difference is the barrel.

So, if you’re looking for a simple drop-in change for your AR-15 that works with all of your existing gear and spare parts then 300 BLK is the way to go.

AVAILABILITY

Having a gun chambered in a kickass caliber doesn’t matter if you can’t find any ammo for that gun. And, right now, 6.8 SPC is winning.

6.8 SPC is just about everywhere — the only place I still can’t find it is Wal Mart. Its been about a decade since the first 6.8 rounds started appearing, and so just about every manufacturer has a load available and ammo in stock. And, thanks to the community of shooters using 6.8 SPC already, there’s no doubt that this round will continue to be available in the future as well.

300 BLK is the new kid on the block. It hasn’t been adopted en masse by military or law enforcement just yet, so there’s no milsurp loads available. But while the “professionals” might not have adopted it, I’ve seen more and more hunters adopting the round as a way to quickly change from their 5.56 M4gery to their hunting rifle. Especially down here in Texas where hog hunting is huge, the ability to switch between subsonic and supersonic and suppress the ammunition effectively is a HUGE plus. That use case has led to a huge demand for guns in the new caliber, and these days just about every manufacturer makes a gun in 300 BLK.

While the growing number of 300 BLK owners bodes well for commercially available loads, one of the best things about 300 BLK is that it will always be available as long as there’s new 5.56 ammo being made. Well, for handloaders at least. Since the 300 BLK round can be made directly from 5.56 brass you will always be able to make ammo for your gun even if the manufacturers stop making it. 6.8 SPC, on the other hand, uses the obsolete 30 Remington cartridge that hasn’t been produced commercially en masse in decades. So if manufacturers stop making 6.8 SPC for some reason, unless you have a stockpile of old brass you’re kinda screwed.

In the end, though, its a tie for availability. 6.8 SPC is already widely available, and 300 BLK has the backing of one of the largest ammunition manufacturers in the world and the largest firearms company (Freedom Group) known to man. Putting aside my conspiracy theory about 300 BLK being Freedom Group’s Apple-like walled garden attempt, that’s a lot of resources being thrown at making 300 BLK a viable caliber for the average shooter.

SUMMARY

Like I said at the beginning, it all depends on what you want to do.

If all you’re looking at is muzzle energy and long distance performance, then 6.8 SPC is the clear winner. Its a field tested and battle proven cartridge with a huge following that can put animals down at longer distances than 5.56 NATO. And if you’re comfortable with the slightly more complex world of parts and ammunition, then go for it.

But if you’re looking for something for hitting living animals up to 200 yards away, does better than 5.56, uses all your existing gear, can swap easily from supersonic to subsonic and is easily suppressed, then 300 BLK is the winner. It may not be a great long distance round, but the compatibility with existing gear really was the feature that sealed the deal for me.

I like 300 BLK. But then again, you knew that already. And really, if I wanted something harder hitting or for longer distances, 7.62 NATO would be my choice.

[Email your firearms-related questions to “Ask Foghorn” via guntruth@me.com. Click here to browse previous posts]

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About Nick Leghorn

Nick Leghorn is a gun nerd living and working in San Antonio, Texas. In his free time, he's a competition shooter (USPSA, 3-gun and NRA High Power), aspiring pilot, and enjoys mixing statistics and science with firearms. Now on sale: Getting Started with Firearms by yours truly!

51 Responses to Ask Foghorn: 6.8 SPC versus 300 BLK?

  1. avatarDrewN says:

    The overwhelming response to this round has me scratching my head where the 6 x 45 is concerned. I still don’t understand why that round hasn’t taken off the same way.

    • avatarOODALOOP says:

      I *LOVE* 6×45! It is my go-to for whitetail hunting. Slightly necked up 5.56, the 6mm round has a great BC, is actually softer shooting than 5.56 (if that were actually possible) and I can get a Sierra 85gr BTHP GameKing going along at 2900 fps. Like Nick was saying, when hunting season hits, I pop off the 5.56 upper, pop the 6×45 upper on, verify the zero on the 3×9 scope that’s mounted to that upper and I’m good to go. Yeah, you have to reload, but like .300 AAC, brass is always available and 6mm bullets are cheap. It’s a great round. I’m actually building a .300 AAC right now because I plan on letting my 9yo daughter use the 6×45 for next year’s season and I’ll use the .300 AAC.

  2. avatarRalph says:

    And really, if I wanted something harder hitting or for longer distances, 7.62 NATO would be my choice.

    That pretty much nailed it right there.

    • avatarGreg in Allston says:

      +1. If I can’t get it at my local merchant of death or the nearest Walmart, at a reasonable price, it’s not going in my stash. I’m not an early adopter. I don’t like paying a premium for something that “fills a gap” (like .45 GAP). “Boutique” ammo, like all things boutique, are for the silly fashionistas. I’ll gladly make due with whatever is at hand.

  3. avatarAccur81 says:

    Excellent article. I would add that there are more energetic and ballisticly efficient loads than the original 6.8 115 OTM load. Namely the Silver State Armory 140 grain Berger VLD at 2400+ FPS and 1800 + FPE from a 16″ barrel. I’ve read reports that actually velocities in a 16″ barrel are around 2450 FPS, but I cannot confirm this because I don’t have a chronograph.

    The 300 has some very cool things going for it, and has added a very cool load using the 130 grain barrier penetrating round based upon the 7.62 x 51 Federal / ATK bullet (it’s either the SOST MK 316 or 319).

    And I still want to know where I can get the custom Pmag that you have in the picture above. It would look dead sexy in my Ruger SR-556…

  4. avatarJester says:

    I definitely agree with Foghorn’s analyses.

    It’s good to remember that .300BLK was designed to replace the MP5 and MP5SD. It makes for a great round when paired with a suppressed SBR. Perfect for home defense, especially with children/other things whose hearing you wish to protect.

    • avatarpman5kmo says:

      300 blk works great in SBR with ultra short barrels… 8″ no problem.. 6.8 spc needs 11.5″+ barrels for optimum effect and range… and does best with a 12.5 or longer barrel.

      4.5 inches is a big difference when you consider a suppressed 300 BLk CAN be as long as a unsupppressed 6.8 spc.

  5. avatarMercutio says:

    Pardon my ignorance – snowflake bolts ?

    • avatarMoonshine7102 says:

      Unique. Not used by any other cartridge.

    • avatarDrewN says:

      One of the big drawbacks of the 6.5 Grendel (as an example) is non 5.56 b.c.g.s and magazines. As a Grendel owner, the bolt doesn’t bother me too much since it’s a one time purchase (although I’m all about saving $200), but not being able to use factory 5.56 AR mags sucks.

    • avatarHuman Being says:

      Something or someone that is out of the norm and requires/demands special treatment thereby is referred to as “being a special snowflake”.

  6. avatarJim Scrummy says:

    Nick, did you buy off the shelf for your 300 BLK M4gery or did you do a build? I know you’ve hunted wild hogs with it, and have you used it for any other huntin’?

    This caliber has intrigued me, because I’ve been on the fence with the 6.8 (meaning spending cashish to buy one) vs. the 300 BLK. Like the interoperability of the weapon system.

    • I haven’t actually successfully shot anything with it yet, though.

      I plan on using it for general hunting this year, everything from deer to hogs. Leupold makes a scope calibrated for 300 BLK with range marking on it for supersonic and subsonic, and I’m planning on putting it through its paces this year.

      • avatarJim Scrummy says:

        Thanks. Looking forward to a write up on your hunting escapades with Mr. Tyler Kee?

        Plus playing with that new toy of yours, the scope should be fun…

  7. avatarLoyd says:

    Nick, thanks for your analysis. I’m building an AR and one of my first big upgrades is going to be a larger caliber upper. I was thinking 6.8 until I heard about .300BLK from you on TTAG. I’ve been fascinated with it much more than any round I’ve ever come across, have have never fired either. This article better articulates which round is more suitable for my needs. Thank you.

  8. avatarLoyd says:

    The article yesterday where someone was up in arms about .300BLK being terrible for hunting actually sold me on the round. You mean to tell me that with a single weapon I can have the equivalent of a .45ACP submachine gun (with subsonic) AND a semi-auto .30-30 (with supersonic)? And all on the exact same platform I’m used to? Yes please.

    • avatarMark N. says:

      Which raises a related question–this whole thing about hunting with silencers in Texas. Are you trying to tell us now, unlike yesterday, that an equivalent to a 45 acp is sufficient for hunting hogs? I don’t know about Texas, but in these parts (northern California) a good sized boar will run 350 lbs–not something I would want to anger with a 45, even if the fmj round is supposed to be able to take down a horse. And you can’t hunt in this state with 223, even for our 100 lb deer.
      Now I am sure some disagree, but I don’t think the 223 is good for hunting anything larger than a varmit. And if the 200 gr subsonic 300blk is less effective than even that….how can it be ethical to hunt with it?

      • avatarLoyd says:

        If I recall, Nick was saying the supersonic round (125gr) mimics a .30-30 and is suitable for some hunting, but the subsonic 200gr round mimics .45 and was a terrible idea.

  9. avatarDyspeptic Gunsmith says:

    An additional issue in the 6.8 is that many of the barrels available are obviously using the same blanks as intended for .270 Winchesters – they have a 1-in-10 twist.

    This is too fast for the lighter bullets the 6.8 SPC uses. The lightest pills one typically sees in the .270 Win are the 110gr varmint pills (they make coyotes look like they scarfed down a frag grenade). Most of the time, tho, .270′s are pushing pills from 130 to 150gr, and for the latter, the 1-in-10 is pretty nice.

    For the lighter 6.8 SPC loads (eg, 75 to 85gr), however, it would be much better to back off the twist to 1-in-11 or 1-in-12. If you could split the difference, you’d be able to cover the whole spectrum of .277 pills being used on the 6.8.

    • avatarJosh says:

      It’s pretty rare to find 1:10s in new manufacture. Even Stag, who was rather famously stubborn about the twist, sells 1:11 barrels now. A 1:12 isn’t a good idea with the shift to heavier bullets for the cartridge.

  10. avatarKnowWhatIamTalkingAbout says:

    For me personally, I am hesitant to go with the latest and greatest in caliber. To some degree, I believe it is the gun and ammo manufacturers wanting to sell more guns and ammo. More power to them if that is true. I prefer to stick with tride and true calibers – for hunting – 30-06 or .308 (Big Game); Varmints and prairie dogs – .223, .17 HMR or .22lr. Yes, I know the .17 HMR has not been around for very long considering cartridge history, and it did take me awhile to jump on that bandwagon.

    If you want the latest and greatest, that is just fine. Of the calibers that I listed, there is nothing you can’t hunt or go after with, and it would get the job done.

  11. avatarbill says:

    6.5 Grendel all the way.

  12. avatarJosh says:

    Um… nobody in the 6.8 community actually uses 5.56 mags. I’m not sure if you intended it to sound like a 6.8 can’t load more than 5-6 rounds, but that’s just for people who don’t want to buy a 6.8 mag. Granted, your point is about ability to use ubiquitous 5.56 equipment, but nevertheless. In case no one else mentions it, you can get 25-rounders, and there’s a rumor about a drum mag coming out soon…

    • avatarAgitator says:

      Correct. I can get about 5 6.8mm rounds in a 5.56mm Lancer mag before it starts to split. The Barrett 30 rounders are the way to go.

  13. avatarDan says:

    Where 300blk truly shines is it is a fantastically versatile round, few other rounds come close to the versatility of 300blk on the AR platform.

    300blk is also pretty much future-proofed. AAC / Freedom group could go bankrupt tomorrow and it would matter naught for the availability of 300blk. As long as .223/5.56 brass and 308 projectiles are available, 300blk will survive.

  14. avatarEvan says:

    I don’t know if anyone is still following this article, but does anyone have opinions on how the 6.5 Grendell (might be spelled wrong) pairs up against the 6.8 SPC as well as .300 BLK? I haven’t heard too much about the 6.5 but what I have heard seems pretty good. Not considering issues of availability, what are some ideas about this round?

  15. avatarJoe Brown says:

    Snowflake bolts? Being in the industry I have never heard of a snowflake bolt so where did you get you snowflake bolts Foghorn? Re bolts being weaker and muzzle energy the cause. It should actually be the “bolt thrust” that would cause the bolt to have a higher failure rate but there doesn’t seem to be any reports of bolt failure with the 6.8 if you look around the forums. Federal is now loading 6.8 ammo. I believe Federal-ATK is quite a bit larger than Remington.
    The truth about guns huh?

  16. avatarStephen says:

    Snowflake? Really? 6.8 bolts are not thinner or weaker than 5.56 bolts and are readily available. You clearly enjoy your 300BO. I’m not convinced you know anything at all about the 6.8 in its present form. I laughed when I saw your bullet drop graph. While it makes sense to zero a 300BO at 100 yards, 225 is best for the 6.8. Also, I’ve never known anyone to just screw on a new barrel to an existing upper/bolt/carrier as these parts wear together. And you’d want your gunsmith to check your headspacing. The AR weapon system modularity is best utilized by swapping out full uppers. I think you know this.

    6.8 mags are plentiful. .277 bullets are more varied and plentiful than .308 and the cost per 100 is approximately the same as for 50 .308 bullets. Reloading powder options are wide open for 6.8 which allows me to shoot 120gn Hornady SSTs at 2650 fps, swap mags and shoot surprisingly accurate reversed 160gn BTSP subsonic rounds at 1050fps (yes, they do cycle the bolt and do not keyhole at 100 yds) all out of a 16 inch barrel.

    The 6.8×43 and 300BO are both fun and each has its fans. Let’s not murk the decision-making process for those choosing their next rifle with needless hyperbole, okay? Besides, everyone knows the REAL fun AR round is the wildcat based off the 6.8×43 – a 30 cal round in a reformed 6.8 case called the 30 HRT.

  17. Lets cut to the heart of the matter. The only logical reason to own the .300 BLK is if you have a suppressor and want to go subsonic.

    I strongly suspect any success the round currently enjoys speaks more to the popularity of PMAGs than any real world ballistic advantage.

    • avatarCA.Ben says:

      Personally, I would love a suppressed 30BLK SBR with supersonic ammo. That sounds like the perfect home defense gun to me. A little sonic crack? Yeah, but greatly increased power.

      Too bad I live in CA…
      For the moment.

    • avatarJosh says:

      Or you have need for a short barrel application. The 300 BLK has the same performance out of a 9″ barrel as the .223 does a 16″ barrel.

  18. avatarGreg says:

    I want to see some testing with the 6.8 and the 26 inch long barrel rifle. Especially the new 140 grain and the hornady 120 grain, oh, and I want it long distance too!

  19. avatarColtsrule101 says:

    One comparison to do that is glaring between the 300 blk and the 6.8 is in minimum energy at distance
    The best bullet I could find for the 300 blk drops below 1000 ftlbs at 128 yards

    The 6.8 bullet I hunt with drops below 1000 ft lbs at 275 yards (120g Hornady SST)
    Thats over DOUBLE the range!
    1000 ft lbs is a rule of thumb for many for hunting mid sized animals

    Also some of the benefits of swapping barrels and bolts is a moot point because almost everyone buys a dedicated upper, and nobody I have seen swaps barrels back and forth …….. They have dedicated 223 uppers

  20. avatarColtsrule101 says:

    Lastly the mags are being dedicated as well, because of published kabooms because people put the wrong mags in their weapon.

    Both calibers have their benefits but to me it isnt close……..6.8 by a mile (or at least double)

    • avatarJosh says:

      I’m planning on coloring the portion of my mags that are covered by the magwell. (I’ve been an FAL guy for years, now I’ve been drawn in to use the AR, finally).

      I’ll use red (power!) for 6.8, blue (NATO) for 5.56/.223 and white (emphasizing black of the mag) for .300 BLK. If I ever get into 6.5 Grendel, I’ll use green, for the monster from Beowulf. :D

  21. avatarSilentSecessionist says:

    1.) My upper is an LMT MRP. For me, a barrel-ONLY swap makes a lot more sense than to some others.

    2.) this trend amongst you guys (the readers, not the writers) to constantly spout “Stop liking what i dont like!” is really aggravating. It really makes me want to avoid the comment section.

    3.) 300BLK and 6.8 should probably never be compared. nor should 6.8 and 6.5 Grendel. 300BLK is a direct replacement for 5.56 and has essentially rendered it useless, but 6.8 and 6.5 are both better. different class, but different cost.

    4.) where did this “300BLK is only good subsonic with a suppressor” line come from? It has more energy than 5.56, is THAT only good suppressed?

    5.) I know it’s tiny, but It’s nice that 300BLK can use all the muzzle devices built for 7.62×51. :)

    I think that the fact that Leupold is making the many of their optics, like the VCOG, for only 5.56, 7.62×51, and 300 Blackout, and also that ALMOST every AR maker has 300BLK in their line means it’s pretty close to here to stay. In a relatively short time on market it’s taken a large percentage of the market-share.

  22. avatarLil' Tommy says:

    Re: 300 BLK ammunition. The “well dried up” after the horrible Newtown CT shooting! That was pretty much a “water-shed” moment for legitimate, law-abiding firearm owners *and* the 2nd Amendment. And – for months – ALL calibers.

    Haven’t seen a single round of retail 300 BLK since then – and it’s mid-November 2013 right now. Still can’t find CCI .22 LR “mini Mags” ……..

    But my 300 BLK build isn’t something I regret since there should be 5.56 brass until the end of time – and every possible variant of 7.62mm bullets imaginable. Add in Hodgdon H110 powder and reloading apoears to be my next mountain to climb.

    Have taken 2 wild boar with my “Blackie” and they were both one-shot, “Texas 2-steppers”; the rounds hit the target and they both took just a couple of lurch-steps and simply dropped. Both times, the guide said it looked like they’d been struck by lightning …….. Rounds were commercial with a Barnes Vor-TX bullet and there was no exit wound. One oinker was only out ~ 50m; other was a big boy out about 80-85m.

  23. avatarzac says:

    good info, i cant stand when someone uses the term m4gery…..an m4 is an m4, whether its auto or not, it may not be a m4a1, but its a m4, noone calls the semi auto thompsons i see ppl with all the time thompson4gerys or 1911s 19114gerys….come on

  24. avatarRick says:

    Nice write up, I have always wondered what the differences of these two rounds were and I can now agree that the .300 AAC Blackout definitely has a role to play in hog hunting and CQB. Other than that 7.62×51 for anything passed 250 yards. I like the 5.56×45 because its accurate and cheap and that’s it.

  25. avatarRick says:

    http://www.bulkammo.com/bulk-300-aac-blackout-ammo-300aac155grnoslerpnw-400
    400 Rounds of .300 AAC Blackout Ammo by PNW Arms – 155gr HPBT
    Plenty of this in stock at Bulk Ammo 1/3/2014.

  26. Pingback: U. S. military: From 5.56 to 6.8 SPC ? | Down Range TV

  27. avatarred says:

    out to 200 yards-450 Bushmaster with a 250 grn bullet -game over

  28. avatarSwitch says:

    I like the 6.8. Load the usually weights but have shot 130 gr @ 2300fps from a 16″bl. Working with 150 SP for subsonic loads.
    See a lot of 300 BLKs for sale.

  29. avatarSteve says:

    Wow, can you be anymore of a 300 fanboy, you need to do some research about the 6.8 before you write, your article reads like the Obama care law. Let’s talk about the truth the next time you write something sport.

    • avatarSwitch says:

      I never have had a problem with my 6.8s., RRA, Stag, CMMG system, AR performance. Piston and/or direct gas impingement systems. Bolt Problems? No; Twist problems? No; Magazine problems? No; Small and Large primer problems? No. I use a number of mags and they are made of carbon steel or stainless steel. Try PRI, C Products and Barrett,

      I would not call a 6.8 a long range cartridge, but a medium range cartridge. Shooting out to 400 yards is not a problem to hit a 12″ plate any day or weather conditions. Generally shoot 110 and 115 grain bullets. If you want a 300BLK, try a 140 or 150 SP bullet in a 6.8.

      Great debate!

      • avatarSwitch says:

        Oh, Bought some ATK-Federal Fusion 115 gr @ 2450fps, 16″ Bl from WalMart. I believe it cost $23. Not exactly sure of the velocity but remember it was lower than my usual 2600fps.

  30. avatarAdam Anderesn says:

    The 6×45 can be loaded with 80 to 90gr to nato pressures and produce flatter trajectory and more energy and trauma on target than any other 5.56 derived caliber. AA2230, benchmark and H4895, W748, R15 and varget are good performance depending on bullet weight and barrel.
    80gr can be pumped to 3000fps at nato pressures that both the Nato cases and mil spec bolts are designed for.
    The AK and specially the whisper/blackout do not come anywhere near.
    But even the EK round for reloaders can move the 150gr bullets quite decently. The blackou doesn’t have enough case capacity for doing that.
    Look it up. The editors on this magazine should also look it up before publishing the article.

  31. avatarBTDT Vet says:

    I hate to break some hearts and egos, but 300 BLK is pretty low on the scale of rifle use. It is good for subsonic work, but that is it. 6.8 and 6.5 kick its azz all over on SD, power, velocity, range. Even the AK’s 7.62x39mm kicks the hell out of the 300 BLK. 300 BLK was what Remington failed to do and market the 6.8 SPC and 30 Rem AR. If you reload, it is nothing to brag about. I have owned 300 BLK, 6.8 SPC, AR10 308 Win and the 6.8 SPC is the best out of the lot. If you really want stopping power at the same 200yd and under range- buy a 458 SOCOM. That is the Mack Daddy of stopping power for hogs / game and it has way better bullet selection. I shoot one of those too. 300 BLK was a huge marketing strategy by Remington because they realized they failed earlier and have idiots working corporate level and not hunters / shooters and it shows by their stupid advertising corporate suit type non shooters. If you really want stopping power, 458 SOCOM or 450 Bushmaster – either one shame the 300 BLK. For regular deer hunting / hog work 115 Federal Fusion Bonded 6.8 SPC works better- velocity and wound cavity than any 300 BLK ever will.

  32. avatarBTDT Vet says:

    Also at $20 for 20 rounds the 450 Bushmaster or 6.8 SPC are more cost effective at being accurate and better wound cavity in game. If you reload, it even gets better. I can’t believe people hype the 300 BLK like it was never the 300 Whisper before Silvers got a hold of it for Remington. 6.8, 6.5, 450, 458 all are better hunting calibers than the 300 BLK at supersonic levels. Subsonic- 300 BLK with 220gr is a great pest control option. Problem is…. 338 Spectre is better and I own one of those as well… ha

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