I know several shooters that have gone to a .22LR AR15. While they might shoot small furry critters with them on occasion they primarily want to shoot cheaper ammo. Personally I think you're in pretty good shape with your 5.56 and 6.8SPC. I have the same calibers as you and had thought at one time about getting into a 458 SOCOM. The problem is that I don't reload and 458 ammo costs an arm and a leg. I already have a wallet killer in my .338 WinMag BAR. I think instead of another caliber I'm going to buy a can for my 5.56.
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