My 14 twist .22-250 shoots the Hornady 60 gr SP quite well, but the slightly longer 60 gr HP is just wild. So I figure a 12 twist will do fine with either. It will not handle much heavier bullets, though.
But, like Tuttle, mine is best with the 52 gr SMK. I am not surprised he does not get as good results with FMJs.
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