I bought the 450 bushmaster in AR platform because I hunt hogs and like the knockdown power, entry hole you can stick your pinky finger in, exit hole your fist. So far everything I've shot has dropped in its tracks to include 300+lb hogs. Deer don't stand a chance, but I head or neck shoot in most cases. Mine must have the heavier buffer spring because felt recoil at the range today was more like a light load 20g at the most or 243 maybe, on game not noticeable. I have 16" barrel with muzzle break shot groups were 1" @ 100 yards on weighted bench, my longest shot to date is 125 yards, most shots are 60-100 yards. My Simmons scope eye piece fell apart so I'm upgrading to a vortex 3x12x56 hog hunter, love the red dot feature, I had a stroke and it left me blind in one eye, not my shooting eye, lol hope this will help at low light and help with my loss of depth perception and focusing. Definitely recommend although ammo high, get you a 7.62x39 upper and go plinking. , The .450 Bushmaster (11.48x43mmRB) is a rifle cartridge developed by Tim LeGendre of LeMag Firearms, and licensed to Bushmaster Firearms International. The .450 Bushmaster is designed to be used in standard M16, M4, and AR-15 rifle lower receivers, using modified magazines and upper receiver assemblies., 450 Bushmaster is a fantastic hunting round that is legal even in midwestern states! Learn about 450 Bushmaster ballistics, history, and much more!.