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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: 1142199" data-attributes="member: 2736"><p>Maybe if we can start over it will clear up some of your questions.</p><p></p><p>First = If you use the bore of the barrel to align it, The bore must be true end to end, and the bore must be perfectly round and the lands and groves must be consistent with each other(The same height/depth. This is why a premium barrel must be used. If you start with a barrel that has poor straightness tolerances you will never get a true bore straightness, just an average of the worst/best of that bore.</p><p></p><p>Some Premium barrel makers list there straightness tolerance. I prefer the ones that have a Bore straightness of .0001 end to end. (At least I start with a true barrel that has a chance of being very good). Some will be better than that , but that is the maximum run out that will be excepted and shipped to the customer.</p><p></p><p>A barrel that starts out more (some have a rejection of .003 end to end, Not .0001) and it would be impossible to do a very good job or alignment. you might luck out and end up with a shooter but the odds are stacked against you.</p><p></p><p>Now assuming you have a barrel with a .0001 or better end to end TIR and you use a indicator rod</p><p>or any bore alignment device. Longer is always better (Just like site radius). also the tool has to fit the bore perfectly, no exceptions. if it doesn't contact "ALL " of the lands you are wasting your time with that tool.</p><p></p><p>The dial indicator should be at least a .0005 or better yet a .0001 indicator and preferably a last word type (They have a small range and have very little spring loading that could cause any deflection of the tool.</p><p></p><p>The term trash in trash out definitely applies when setting up a barrel for chambering. Good barrels, good tools, and knowledge of the best way to use them is a big start in getting a quality job. Last but not least is the craftsmanship and persistence in getting the best set up possible. all of this normally equals an accurate rifle.</p><p></p><p>I hope this helps. And thanks Barrelnut , for the kind words. I would like to think that all good smiths would try there best every time because they want to.</p><p></p><p>J E CUSTOM</p><p></p><p>PS: My experience has been that the more precise the tolerances throughout the build, The more forgiving the rifle is to different loads(It will shoot everything good, but when you do load development and find the best load, It will blow your socks off).</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1142199, member: 2736"] Maybe if we can start over it will clear up some of your questions. First = If you use the bore of the barrel to align it, The bore must be true end to end, and the bore must be perfectly round and the lands and groves must be consistent with each other(The same height/depth. This is why a premium barrel must be used. If you start with a barrel that has poor straightness tolerances you will never get a true bore straightness, just an average of the worst/best of that bore. Some Premium barrel makers list there straightness tolerance. I prefer the ones that have a Bore straightness of .0001 end to end. (At least I start with a true barrel that has a chance of being very good). Some will be better than that , but that is the maximum run out that will be excepted and shipped to the customer. A barrel that starts out more (some have a rejection of .003 end to end, Not .0001) and it would be impossible to do a very good job or alignment. you might luck out and end up with a shooter but the odds are stacked against you. Now assuming you have a barrel with a .0001 or better end to end TIR and you use a indicator rod or any bore alignment device. Longer is always better (Just like site radius). also the tool has to fit the bore perfectly, no exceptions. if it doesn't contact "ALL " of the lands you are wasting your time with that tool. The dial indicator should be at least a .0005 or better yet a .0001 indicator and preferably a last word type (They have a small range and have very little spring loading that could cause any deflection of the tool. The term trash in trash out definitely applies when setting up a barrel for chambering. Good barrels, good tools, and knowledge of the best way to use them is a big start in getting a quality job. Last but not least is the craftsmanship and persistence in getting the best set up possible. all of this normally equals an accurate rifle. I hope this helps. And thanks Barrelnut , for the kind words. I would like to think that all good smiths would try there best every time because they want to. J E CUSTOM PS: My experience has been that the more precise the tolerances throughout the build, The more forgiving the rifle is to different loads(It will shoot everything good, but when you do load development and find the best load, It will blow your socks off). [/QUOTE]
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Why dial a rifle bore within .0001"
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