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I know people who use 45gr loads in a 1/7 twist AR all the time with no signs of keyholing, etc. I can't imagine that you'd want much of anything other than 55gr ball for SHTF situations anyway given its ease of availability and price as compared to other 5.56 ammo. Same for "civy" lead-nosed stuff around the 55gr range. The 1/7 will work perfectly well for 55gr.
 
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