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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lapping A Barrel
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<blockquote data-quote="birdiemc" data-source="post: 1786659" data-attributes="member: 29632"><p>Well the abrasive on a patch idea seems pretty bad because it's going to round off the corners of the lands vs. keeping them nice and sharp, so I'm not suggesting that it's something I was going to try...I'm just curious about the before and after of a correctly lapped barrel.</p><p>A job I once held I used to have to lap flat brass seals, our surface plate was Grade AA, so if I recall correctly that's flat to .000001" and is what was required to get two pieces of brass to create a liquid tight seal, so I understand the level of precision equipment that's required to do that. </p><p>I just want to understand better how that all works in the barrel of a rifle.</p><p></p><p>It's interesting that you say they measure with a bore gauge accurate to .0001. Any picture I've seen from somebody slugging their barrel the slugs usually have voids and strange markings. It seems the slugs would also pick up any tool Mark's left behind which wouldn't seem ideal as they would create a high or low on the lap maybe? Also does the molten lead poured into the muzzle cause it to expand in that area resulting in a lap that is larger than desired? All just things I'm curious about. I posted in the gunsmithing forum because I'm wanting to hear from people with true knowledge on the subject not just what they read in a magazine or on the internet somewhere. But I dont know...do gunsmiths lap barrels or just only use factory lapped barrels?</p></blockquote><p></p>
[QUOTE="birdiemc, post: 1786659, member: 29632"] Well the abrasive on a patch idea seems pretty bad because it's going to round off the corners of the lands vs. keeping them nice and sharp, so I'm not suggesting that it's something I was going to try...I'm just curious about the before and after of a correctly lapped barrel. A job I once held I used to have to lap flat brass seals, our surface plate was Grade AA, so if I recall correctly that's flat to .000001" and is what was required to get two pieces of brass to create a liquid tight seal, so I understand the level of precision equipment that's required to do that. I just want to understand better how that all works in the barrel of a rifle. It's interesting that you say they measure with a bore gauge accurate to .0001. Any picture I've seen from somebody slugging their barrel the slugs usually have voids and strange markings. It seems the slugs would also pick up any tool Mark's left behind which wouldn't seem ideal as they would create a high or low on the lap maybe? Also does the molten lead poured into the muzzle cause it to expand in that area resulting in a lap that is larger than desired? All just things I'm curious about. I posted in the gunsmithing forum because I'm wanting to hear from people with true knowledge on the subject not just what they read in a magazine or on the internet somewhere. But I dont know...do gunsmiths lap barrels or just only use factory lapped barrels? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lapping A Barrel
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