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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lapping a Barrel?
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<blockquote data-quote="Gunpoor" data-source="post: 508106" data-attributes="member: 8358"><p>First, just to clear the air, I am no expert. That said, I have hand lapped a couple of rifle barrels. The way I lap them is to get a soft/swaged lead bullet just larger than groove diameter and a wooden dowel rod that will fit through the bore of your project rifle, the larger the better as long as it fits, and some lapping compound (valve grinding compound might work but I have never used it). Push the lead slug through the bore from the breech end and remove it at the muzzle end. You will probably encounter quite a bit of resistance because it is engraving the slug to the rifle bore. Then put some lapping compound on the shaped slug and push it through the bore the same direction as before but hold the barrel end against a non-marring surface so the slug doesn't exit the barrel. Then push it through the bore from muzzle to breech. Repeat this process continually and occasionally add more lapping compound until the bore is polished to your satisfaction. The last rifle I hand lapped went from a fairly accurate rifle to a one-ragged-hole shooter that hardly leaves any guilding material in the bore after 25 fired rounds. BTW, I don't use bore brushes in my rifles when cleaning just foaming bore cleaner and cotton patches.</p></blockquote><p></p>
[QUOTE="Gunpoor, post: 508106, member: 8358"] First, just to clear the air, I am no expert. That said, I have hand lapped a couple of rifle barrels. The way I lap them is to get a soft/swaged lead bullet just larger than groove diameter and a wooden dowel rod that will fit through the bore of your project rifle, the larger the better as long as it fits, and some lapping compound (valve grinding compound might work but I have never used it). Push the lead slug through the bore from the breech end and remove it at the muzzle end. You will probably encounter quite a bit of resistance because it is engraving the slug to the rifle bore. Then put some lapping compound on the shaped slug and push it through the bore the same direction as before but hold the barrel end against a non-marring surface so the slug doesn't exit the barrel. Then push it through the bore from muzzle to breech. Repeat this process continually and occasionally add more lapping compound until the bore is polished to your satisfaction. The last rifle I hand lapped went from a fairly accurate rifle to a one-ragged-hole shooter that hardly leaves any guilding material in the bore after 25 fired rounds. BTW, I don't use bore brushes in my rifles when cleaning just foaming bore cleaner and cotton patches. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Lapping a Barrel?
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