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Rifles, Reloading, Optics, Equipment
Gunsmithing
contouring a barrel
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<blockquote data-quote="shortgrass" data-source="post: 1035799" data-attributes="member: 24284"><p>I have some aftermarket barrels that are not lapped. The don't shoot quit as well as those that I have that are hand lapped. Anyone with a bore scope can see the difference. The inside of those that aren't lapped are rough and have many places to collect fouling even after 200-300 rds. They took much more load development, too. On a couple, thats where the 300rds came from. I can expect sub 1" groups for 5 or 6 shots, at the most, from those that are not lapped. After that accuracy, degrades terribly. Those barrels that are lapped hold their accuracy for much longer between cleanings. I can shoot a 60rd. LR Sporting Rifle match, without stopping to clean during the match, with those that are lapped. Besides, there may not be time enough to clean during a match. As for contouring, there's huge difference between countouring from straight blank to a Palma contour and contouring to even a heavy sporter contour.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1035799, member: 24284"] I have some aftermarket barrels that are not lapped. The don't shoot quit as well as those that I have that are hand lapped. Anyone with a bore scope can see the difference. The inside of those that aren't lapped are rough and have many places to collect fouling even after 200-300 rds. They took much more load development, too. On a couple, thats where the 300rds came from. I can expect sub 1" groups for 5 or 6 shots, at the most, from those that are not lapped. After that accuracy, degrades terribly. Those barrels that are lapped hold their accuracy for much longer between cleanings. I can shoot a 60rd. LR Sporting Rifle match, without stopping to clean during the match, with those that are lapped. Besides, there may not be time enough to clean during a match. As for contouring, there's huge difference between countouring from straight blank to a Palma contour and contouring to even a heavy sporter contour. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
contouring a barrel
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