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Rifles, Reloading, Optics, Equipment
Gunsmithing
? about bad barrel blank
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<blockquote data-quote="J E Custom" data-source="post: 1773744" data-attributes="member: 2736"><p>Not hijacking his post, but the OD of a barrel is often not concentric with the bore. When I check the centers for straightness I also check the OD of the barrel to check I for runout and If it is not true to the bore I re-contour the barrel.</p><p></p><p>This prevents the barrel from changing POI as it heats up due to the thickness difference in the barrel wall.</p><p></p><p>As far as runout of the bore you should try to get it within a few 10 thousandths (.0002) if possible for the accuracy of the chamber.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1773744, member: 2736"] Not hijacking his post, but the OD of a barrel is often not concentric with the bore. When I check the centers for straightness I also check the OD of the barrel to check I for runout and If it is not true to the bore I re-contour the barrel. This prevents the barrel from changing POI as it heats up due to the thickness difference in the barrel wall. As far as runout of the bore you should try to get it within a few 10 thousandths (.0002) if possible for the accuracy of the chamber. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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? about bad barrel blank
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