The 1:12 twist is for 55 grn or lighter. Look in the 45-53 range. My CZ with 1:12 loves 45 grn bullets. I would like to get a bolt with 1:9 or 1:8 to handle the heavier bullets. Savage uses a 1:9 twist. Tikka T3 light has a 1:8 twist.
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