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Rifles, Reloading, Optics, Equipment
Gunsmithing
Why dial a rifle bore within .0001"
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<blockquote data-quote="Canadian Bushman" data-source="post: 1142297" data-attributes="member: 41122"><p>You can, and some smiths do, but you are assuming that the barrels bore runs straight and true between those two points. Often with gundrills the path of the hole is a long arc or even a corkscrew. Sometimes the reaming process eliminates this ( partially ) but a reamer will typically follow the bore ( reamers styles and shapes affect thier ability to do this ). </p><p></p><p>If the chamber reamer is fighting to follow a hole because the angle of inclination is to great, it will increase cutting forces, and usually cause one side of the reamer to do more cutting than the other if not all of it and the result will be a chamber that differs from the actual shape of the reamer. It could even cause a bad finish or chatter. My biggest worry is freebore that isnt concentric to the major dia of the rifled bore. </p><p></p><p>Now i personally believe it takes much more than a few tenths to cause a piloted reamer to do this to any significant effect, and i also believe things like poorly ground reamer or mis-aligned tail stock are much more likely to cause these problems than runout. </p><p></p><p>However if i can buck the barrel so the bore where the reamer is cutting will be as straight and centered as im able to get it, then hopefully the reamer will center up and cut within a very small tolerance of where it was ground. </p><p></p><p>If i had a guy who insisted i cut his barrel in that manner i wouldnt be opposed to doing it. I think most barrels run good enough the reamer would follow and also the barrel would center in the stocks channel perfectly with no timing. I know some guys who used to cut barrels that way and all of them say that most of the barrels shot well and some shot really well. </p><p></p><p>On a side note, a gunsmith that i know and use, and believe to be a very talented machinist once told me a customer brought him a barrel that ran out very bad. Smooth well sized bore but "hooped" big time in the middle. He called the customer, showed him the barrel running in the machine, and the customer told him to cut it. So he did. Customer reported it was one of the better shooting barrels he owned. Ill buy you a beer and lunch if you can explain that one.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 1142297, member: 41122"] You can, and some smiths do, but you are assuming that the barrels bore runs straight and true between those two points. Often with gundrills the path of the hole is a long arc or even a corkscrew. Sometimes the reaming process eliminates this ( partially ) but a reamer will typically follow the bore ( reamers styles and shapes affect thier ability to do this ). If the chamber reamer is fighting to follow a hole because the angle of inclination is to great, it will increase cutting forces, and usually cause one side of the reamer to do more cutting than the other if not all of it and the result will be a chamber that differs from the actual shape of the reamer. It could even cause a bad finish or chatter. My biggest worry is freebore that isnt concentric to the major dia of the rifled bore. Now i personally believe it takes much more than a few tenths to cause a piloted reamer to do this to any significant effect, and i also believe things like poorly ground reamer or mis-aligned tail stock are much more likely to cause these problems than runout. However if i can buck the barrel so the bore where the reamer is cutting will be as straight and centered as im able to get it, then hopefully the reamer will center up and cut within a very small tolerance of where it was ground. If i had a guy who insisted i cut his barrel in that manner i wouldnt be opposed to doing it. I think most barrels run good enough the reamer would follow and also the barrel would center in the stocks channel perfectly with no timing. I know some guys who used to cut barrels that way and all of them say that most of the barrels shot well and some shot really well. On a side note, a gunsmith that i know and use, and believe to be a very talented machinist once told me a customer brought him a barrel that ran out very bad. Smooth well sized bore but "hooped" big time in the middle. He called the customer, showed him the barrel running in the machine, and the customer told him to cut it. So he did. Customer reported it was one of the better shooting barrels he owned. Ill buy you a beer and lunch if you can explain that one. [/QUOTE]
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Why dial a rifle bore within .0001"
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