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Old December 27, 2012, 11:00 AM   #17
SL1
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Join Date: November 8, 2007
Posts: 1,997
From the standpoint of peak pressure, the groove (and bore) diameter just ahead of the chamber is most important.

From the standpoint of accuracy, the diameter should be uniform or slightly DECEASING as you move from the chamber to the muzzle.

SL1
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