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Ok lets not go there I have an 7/8" octagon barrel being made for my H&A action. So that is .875 OD minus the .400 bore dia. what length does the threads need to be on nipple to make good ignition but not protrude into the bore ? I know they come in 1/4x28 & 1/4x32, which would be the best to drill n tap for ?
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