As ammo goes, 9mm is a high-pressure round and 9mm +P is, naturally enough, even higher. DoubleTap loads their ammo generally towards the hotter end of the spectrum. So what happens when DoubleTap loads up a 115-grain 9mm +P round? They claim a scorching 1,395 feet per second from a 4″ barrel. For comparison, CorBon’s 115-grain +P DPX is rated at 1,250 fps and Barnes’ TAC-XP 115-grain +P round 1,100 fps. Now, a 3″ barrel won’t deliver quite that much velocity, but — what will it do? And how does it perform? Due to the generosity of one of his viewers, STB410 got a chance to find out.