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My Sako has a 1 in 14 twist and it dislikes anything over 55 Gr. 60 Gr stuff will shoot OK, but not well. Many .222 Mags have a 1 in 12 twist, which may shoot 60's OK. I shoot mostly 50 to 55 Gr stuff in it, although it will shoot lighter stuff very well.
H335 shoots well for me. It does a little better using mag primers. (205M is what I used) IMR 4895 also shoots well. No mag primer needed, but it doesn't hurt either. 2015 shoots really well. I only tried it because I had some, but was pleasently surprised. Same for primers. Either standard or mag works well.
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