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57 x 28 or 9mm?

I'm on the fence and am trying to consolidate ammo for when shtf. I just got the Smith and Wesson M&P 57 (no safety, of course) and its out performing my S&M MP 9c on penetration and accuracy...but the ammo is super expensive.....plus its not a common round. I'm wondering if I should stick with the 9mm for those two reasons? side note: the green tip 57x28's penetrate class 2 body armor and they will put a serious hurting on class 3.

I'm on the fence and am trying to consolidate ammo for when shtf. I just got the Smith and Wesson M&P 57 (no safety, of course) and its out performing my S&M MP 9c on penetration and accuracy...but the ammo is super expensive.....plus its not a common round. I'm wondering if I should stick with the 9mm for those two reasons? side note: the green tip 57x28's penetrate class 2 body armor and they will put a serious hurting on class 3.

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I'm a bit late to the conversation, but I have the same philosophy. I've got 5.56 for my main gun, for generic protection/missions/general use. It's cheap, fast, low recoil, accurate, etc. The AR10 would stay at home base or be used for select missions. Base protection vs personnel protection. Specific use vs general use.

Oh Shit! I gotta pick one and run! I'd take the 5.56. With my 9mm as well.