Best to slightly over spin (stabilise) a projectile than the over way. If you need a 1 in 9 but use a 1 in 8 then all good. But if you only need a 1 in 12 and use a 1 in 7 then the cons above would apply. If you are going to the trouble of rebarreling something then you should use an appropriate twist for the projectile you plan to use
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