OD at the muzzle ? If .80"+ the twist will more that likely be 1-9, If the OD in around .65" the twist is probable be 1-12. The easy way is to use the cleaning rod method.
OD at the muzzle ? If .80"+ the twist will more that likely be 1-9, If the OD in around .65" the twist is probable be 1-12. The easy way is to use the cleaning rod method.