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IIRC, 1/7 spins 55grn FMJ ammo fast enough it just about guarantees destabilization/fragmentation on impact with a soft target down to about 2400fps or about 200 yds. Soft points would be even nastier.

Remember, it's the yaw effect and subsequent bullet breakup that makes the 55grn FMJ load effective. Once you get below the velocity threshold for that effect, it just punches clean holes in things.

So basically the 55grn in a 1/7 twist is an excellent SHTF/urban load as you are relatively unlikely to be engaging targets beyond the 200yd range.

It's been awhile since I brushed up on my .223 ballistics with different loads but that seems about right. Correct me if I'm off.
 
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