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Rifles, Reloading, Optics, Equipment
Gunsmithing
Tight then loose bore
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<blockquote data-quote="J E Custom" data-source="post: 1111829" data-attributes="member: 2736"><p>When I hand lap a barrel I like to cast the lap in the muzzle because that Is supposed to be the tightest part of the barrel, (When barrels are made and measured, the tightest part of the bore</p><p>is placed at the muzzle before contouring) on quality barrels it may be less than 1/10,000 but</p><p>it is normal to do this.</p><p></p><p>The worst barrel I have ever seen was a mod 70 Coyote. It had 5 tight places up and down the barrel. (Most factory barrels have none and a few have one tight area).</p><p></p><p>If a barrel is subjected to over pressure, it can bulge about 2/3rds down the barrel so it is very unusual for it to be larger in front of the chamber.</p><p></p><p>I would recommend replacing the barrel rather than trying to lap it true. at best you may improve the groups/accuracy to 1 to 1&1/2 MOA.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1111829, member: 2736"] When I hand lap a barrel I like to cast the lap in the muzzle because that Is supposed to be the tightest part of the barrel, (When barrels are made and measured, the tightest part of the bore is placed at the muzzle before contouring) on quality barrels it may be less than 1/10,000 but it is normal to do this. The worst barrel I have ever seen was a mod 70 Coyote. It had 5 tight places up and down the barrel. (Most factory barrels have none and a few have one tight area). If a barrel is subjected to over pressure, it can bulge about 2/3rds down the barrel so it is very unusual for it to be larger in front of the chamber. I would recommend replacing the barrel rather than trying to lap it true. at best you may improve the groups/accuracy to 1 to 1&1/2 MOA. J E CUSTOM [/QUOTE]
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Tight then loose bore
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