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Rifles, Reloading, Optics, Equipment
Gunsmithing
barrel crown
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<blockquote data-quote="J E Custom" data-source="post: 474504" data-attributes="member: 2736"><p>The reason I mentioned the back of the tool was because it is common for the outside of the barrel</p><p>to be eccentric to the bore on lots of factory barrels.</p><p></p><p>When setting up to crown you set up on the bore, just like when installing a break, the threads have</p><p>to be concentric with the bore and the hole has to be concentric with the bore to perform properly.</p><p></p><p>The same thing can happen to the chamber if you setup on the outside of the shank instead of the</p><p>bore.</p><p></p><p>Everything has to be based on the bore center line in order to have an accurate rifle.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="J E Custom, post: 474504, member: 2736"] The reason I mentioned the back of the tool was because it is common for the outside of the barrel to be eccentric to the bore on lots of factory barrels. When setting up to crown you set up on the bore, just like when installing a break, the threads have to be concentric with the bore and the hole has to be concentric with the bore to perform properly. The same thing can happen to the chamber if you setup on the outside of the shank instead of the bore. Everything has to be based on the bore center line in order to have an accurate rifle. Jerry [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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barrel crown
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