The bigger calibers have heavy recoil, low magazine capacity, are expensive to shoot, and are only useful at fairly short range.
My stable includes 5.45 & 7.62 x39(most likely arms of any foreign invaders so I can use their ammo) and a new 300AAC(just in case there's need for a suppressed shooter at some point). If I need more power or range, I have plenty of bolt actions that are easier to feed. I don't choose to tie up an expensive AR platform to provide a 22lr.
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