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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fire Lapping a Barrel
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<blockquote data-quote="Bart B" data-source="post: 801446" data-attributes="member: 5302"><p>Kevin, when at Sierra, did you ever use any of Jim Hull's "Martin's Mustard" bore cleaner?</p><p></p><p>It was made with some special oil and enough extra fine yellow colored dental pumice to be as thick as partially dried paint. Finest non-embedding abrasive known to man at the time and used by dental hygienists to clean teeth. It sure would remove copper jacket fouling as well as just about anything else that gets inside a rifle barrel coating the steel. Martin told me that if you used it for a few hours lapping the leade of the rifling, it would smooth out a lot of the slight roughness left by the reamer. He finished his talk with me saying that smoothing out the leade to be as smooth as the lands and grooves would last for a couple hundred rounds in a .308 Win barrel; after that, erosion from burning powders would rough it up all over again.</p></blockquote><p></p>
[QUOTE="Bart B, post: 801446, member: 5302"] Kevin, when at Sierra, did you ever use any of Jim Hull's "Martin's Mustard" bore cleaner? It was made with some special oil and enough extra fine yellow colored dental pumice to be as thick as partially dried paint. Finest non-embedding abrasive known to man at the time and used by dental hygienists to clean teeth. It sure would remove copper jacket fouling as well as just about anything else that gets inside a rifle barrel coating the steel. Martin told me that if you used it for a few hours lapping the leade of the rifling, it would smooth out a lot of the slight roughness left by the reamer. He finished his talk with me saying that smoothing out the leade to be as smooth as the lands and grooves would last for a couple hundred rounds in a .308 Win barrel; after that, erosion from burning powders would rough it up all over again. [/QUOTE]
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Fire Lapping a Barrel
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