You wait all year to buy ammo in a popular caliber and BANG! another caliber becomes popular while you’re waiting. This time it’s 6.5 Grendel. Wikipedia tells us “the 6.5mm Grendel design goal was to create an effective 200-800 yard AR-15 magazine length loaded cartridge for the AR-15 platform that evoked Anglo-Saxon epic poetry when fired surpassed the performance of the native 5.56 NATO / 223 Remington cartridge.” Et voila! The Hannah Montana of AR cartridges offers a flatter trajectory and greater terminal energy at extended ranges than either the 5.56 or 7.62.” And all you gotta do to take out deer and varmints with 6.5 Grendel up to 800 yards: change the bolt and barrel, load the ammo in a 6.5 Grendel mag, find the critters, take aim and pull the trigger. Underground Tactical started selling their 6.5 Grendel AR bolt yesterday ($79.95). Complete rifles and 6.5 uppers are flying out the door, too. Luckily, good quality 6.5 ammo’s easily available at about a buck a pop. For now.