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Rifles, Reloading, Optics, Equipment
Gunsmithing
Straight barrel
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<blockquote data-quote="J E Custom" data-source="post: 1691880" data-attributes="member: 2736"><p>Barrels are Deep Hole drilled and sometimes it is not straight. In the old days and even now, some barrel makers straightened the bore by bending the outside of the barrel on a barrel straightener. (A special tool for this operation).</p><p></p><p>With the improvements of today's tools this is not as bad and often doesn't need any straightening, But a good Gunsmith will check to see how straight it is and then decide if it needs to go back.</p><p></p><p>Different barrel makers have different rejection specs. ranging from .000 TIR to as much as .007. I don't believe that .001 to .002 has much of an effect on accuracy but don't like any if I can get it. Any more than that is not acceptable to Me.</p><p></p><p>It is not an easy set up to do it right, but well worth the effort. All dimensions are based on the bore Only, and the Outside of the barrel may have to be turned after the bore is deemed straight or you will have different wall thicknesses down the bore that are effected by heat.</p><p></p><p>The other reason for checking Straightness is to monitor the quality of different barrel Brands. Some brands are consistently/always beyond My limits and I just won't build using them. Truthfully, I don't know how much is bad but I do know that no run out is good.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1691880, member: 2736"] Barrels are Deep Hole drilled and sometimes it is not straight. In the old days and even now, some barrel makers straightened the bore by bending the outside of the barrel on a barrel straightener. (A special tool for this operation). With the improvements of today's tools this is not as bad and often doesn't need any straightening, But a good Gunsmith will check to see how straight it is and then decide if it needs to go back. Different barrel makers have different rejection specs. ranging from .000 TIR to as much as .007. I don't believe that .001 to .002 has much of an effect on accuracy but don't like any if I can get it. Any more than that is not acceptable to Me. It is not an easy set up to do it right, but well worth the effort. All dimensions are based on the bore Only, and the Outside of the barrel may have to be turned after the bore is deemed straight or you will have different wall thicknesses down the bore that are effected by heat. The other reason for checking Straightness is to monitor the quality of different barrel Brands. Some brands are consistently/always beyond My limits and I just won't build using them. Truthfully, I don't know how much is bad but I do know that no run out is good. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Straight barrel
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