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or see were it shoots first then descide?
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Work up some loads with .311 SMK's and see how it shoots first.
Mine was minute of angle, but they are long, thin, "whippy" barrels and can be very inconsistent.
I didn't want a barrel that long, and cut/re-crowned to 22", and it did improve accuracy slightly.
Longer barrels provide more velocity, they may be more or less accurate than a shorter barrel.