I disagree, A 250 grain bullet at 2250 FPS most definitely kicks harder than a410 shotgun, and a .243
so you made me go looka 450 Bushmaster kicks no more than a .410. I am always miffed when people start talking about .450 bushmasters being mules.... any other centerfire rifle cartridge...heck a .243 kicks harder than a .450 bushmaster.