The .905-caliber rifle fires rounds about 2,100 feet per second. The gun also has 2,777 foot-pounds of recoil energy, which essentially makes it as powerful – and gives it about as much ‘kick’ – as firing 10 .30-6 rifles at the same time. The company has only produced three of the uber-powerful rifles. If you want to squeeze off a few rounds from a .905-caliber rifle, you’ll need two things: muscles and cash.