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What is the difference between groove diameter and bore diameter?

April 26, 2017bore diameter difference Groove

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What is the difference between groove diameter and bore diameter?

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Groove diameter is the major or largest diameter of the hole through the barrel. Bore diameter is the smallest diameter measured from top of land to top of land within the barrel (if a rod were machined to just fit in the barrel from the muzzle and then measured, this measurement would be the bore diameter).