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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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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