Barrel Bore Lapping

An effective method of bore lapping is a fundamentally sound step toward establishing or restoring rifle accuracy and overall improved performance.

by Norman E. Johnson

Rifle builders and shooters alike must understand that bullets propelled by burning powder gas leave carbon and bullet jacket deposits in the bore and also cause bore erosion. Repeated firing exacerbates the condition. The rougher the bore, the more difficult these accuracy inhibiting conditions will be to prevent or correct. In most cases, a well-established form of bore lapping may be the best approach to the problem. This may include conditioning a new rifle bore that has not been lapped, particularly those of lesser quality, or bores with some use. In any case, a knowledge of bore condition must precede any attempts toward corrective measures.

The premise behind lapping is to…

Read more in the March 2018 issue.

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