Harley, You need to mike the O.D. of your barrel at the muzzle, and order one about with an I.D. of .001 larger. That will give you about the best accuracy you will get with a drop in type bushing.
Good Luck,
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Don Williams www.theactionworks.com www.pickagripcom
Good Luck,
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Don Williams www.theactionworks.com www.pickagripcom