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You don't mention what powder /load your using now but ....
I've always used H4895 for all my 55gr+ .223 loads of semi auto and bolt guns in the 16-22" range. ( Including my ruger MK II) This is a VERY common powder in competitive AR-15 shooting circles. FWIW, if I were going to shoot @ 200 yds+ regularly with that twist, I might try some slightly heavier bullets over that 4895 in the 60-69 gr range.
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