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Unread 06-28-2013, 07:28 AM   #84
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the "not for ball" proof designates a choke or reduction in the bore size.

personally, i follow the advice.

i would think that at minimum you should make sure the ball is a hair smaller the the smallest diameter in that bore. there should be marks for chamber and bore size. tight 10's often have a reduction to 12 bore in the tubes.
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