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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why dial a rifle bore within .0001"
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<blockquote data-quote="J E Custom" data-source="post: 1142603" data-attributes="member: 2736"><p>The deeper/longer the tool goes into the bore the more accurate the reading. PT&G makes a precision ground gauge that goes in until it stops, indicating that the bore is not straight but I have not used one of there gauges because they will only tell you that the bore is not straight, Not by how much.</p><p></p><p>This jump rope effect is normally because the contour was cut improperly and tool push caused the barrel to deflect. As I mentioned earlier, some barrel makers mechanically straighten barrels after they are bored, rifled and contoured to make the bore straight. when done this way the od of the barrel is not true to the bore making the barrel wall uneven in thickness. (I don't use these barrels unless I re-contour the od of the barrel to true it up with the bore.</p><p></p><p>It is simple, in order to get a good barrel the OD has to be true to the bore and the bore has to be straight. If this is not the case, you have a pig in a poke (Unpredictable).</p><p></p><p>I knew there were bad barrels out there but not as many as this post suggest. this will stop if everyone will just send the barrel back. We (Long range shooters) are greatly responsible for the quality of the newer bullets because we complained and the bullet manufactures had to respond or shut there doors, Barrel makers need to be held to higher standards if they want to stay in business</p><p></p><p>I check every barrel (Even my favorite brand)to verify the quality before I start to prevent letting a poor quality barrel from finding it's way in a precision rifle. In my opinion,anyone that has the skill to find a bad barrel should reject it and demand better from their barrel maker. This is also the reason I wont use a pre chambered barrel. it is to late to worry about tolerances and quality. I don't want to find out later after all the machining is done that the poor shooting rifle was caused by a bad/poor barrel.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1142603, member: 2736"] The deeper/longer the tool goes into the bore the more accurate the reading. PT&G makes a precision ground gauge that goes in until it stops, indicating that the bore is not straight but I have not used one of there gauges because they will only tell you that the bore is not straight, Not by how much. This jump rope effect is normally because the contour was cut improperly and tool push caused the barrel to deflect. As I mentioned earlier, some barrel makers mechanically straighten barrels after they are bored, rifled and contoured to make the bore straight. when done this way the od of the barrel is not true to the bore making the barrel wall uneven in thickness. (I don't use these barrels unless I re-contour the od of the barrel to true it up with the bore. It is simple, in order to get a good barrel the OD has to be true to the bore and the bore has to be straight. If this is not the case, you have a pig in a poke (Unpredictable). I knew there were bad barrels out there but not as many as this post suggest. this will stop if everyone will just send the barrel back. We (Long range shooters) are greatly responsible for the quality of the newer bullets because we complained and the bullet manufactures had to respond or shut there doors, Barrel makers need to be held to higher standards if they want to stay in business I check every barrel (Even my favorite brand)to verify the quality before I start to prevent letting a poor quality barrel from finding it's way in a precision rifle. In my opinion,anyone that has the skill to find a bad barrel should reject it and demand better from their barrel maker. This is also the reason I wont use a pre chambered barrel. it is to late to worry about tolerances and quality. I don't want to find out later after all the machining is done that the poor shooting rifle was caused by a bad/poor barrel. J E CUSTOM [/QUOTE]
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Why dial a rifle bore within .0001"
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