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finished case diameter

I have a SDB and would not trade it for the world.  Very consistant. I recently purchased a new barrel from storm lake for a g34.  In the past my 9mm loads worked perfect in the factory barrel.  Rounds were jamming in the Storm lake barrel.  I measured the diameter of the case mouth with the seated bullet and found it to be .382.  Winchester rounds were .375.  I went back and attempted to recrimp a few rounds, but cannot get the slight bell out of the finished round( .382).  The crimping die has had about 2k rounds through it.   Any ideas?

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