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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: 1142264" data-attributes="member: 2736"><p>I have dealt with these tolerances for years and have a list of barrels that I wont use for that reason.</p><p></p><p>Some barrel manufactures build barrels and then grade them from 1 to 4 and other barrel makers make barrels to a spec and if they don't fall at or under that spec. they are rejected. And some barrel makers resort to mechanical straightening. I wont by or use any barrel that has been straightened.</p><p></p><p>Most barrels will have some run out on the outside because of the contouring process and the barrel finish and this has to be dealt with if it is over .002 . from what I can find out from most barrel makers .005 to .007 is the acceptable limit of this run out. I have several barrel makers that know not to send me a barrel with anything more than the bore spec. (.0001) and the outside run out more than .002. </p><p></p><p>Maybe I am to picky, but if they advertise a maximum tolerance, I expect them to deliver what they say. </p><p></p><p>I once had a barrel maker that had to make 3 barrels before one would match/beat there advertised spec. the other barrels were good but just not good enough to meet there #1 barrel tolerances.</p><p></p><p>After building the rifle (A 416 Buffalo) it shot the best group of my life (.034 with a 400 grain bullet).</p><p>so for me this was conformation that quality and precision of the barrel is paramount if accuracy is the goal and the rest is up to the smith.</p><p></p><p>I have heard stories of barrels that were indexed because of barrel run out, I would consider that barrel to be junk and would never use one or buy another from that maker.</p><p></p><p>I am not good enough to turn carbon into diamonds, so I demand the best I can get and wont compromise my standards. (I need all the help I can get).</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1142264, member: 2736"] I have dealt with these tolerances for years and have a list of barrels that I wont use for that reason. Some barrel manufactures build barrels and then grade them from 1 to 4 and other barrel makers make barrels to a spec and if they don't fall at or under that spec. they are rejected. And some barrel makers resort to mechanical straightening. I wont by or use any barrel that has been straightened. Most barrels will have some run out on the outside because of the contouring process and the barrel finish and this has to be dealt with if it is over .002 . from what I can find out from most barrel makers .005 to .007 is the acceptable limit of this run out. I have several barrel makers that know not to send me a barrel with anything more than the bore spec. (.0001) and the outside run out more than .002. Maybe I am to picky, but if they advertise a maximum tolerance, I expect them to deliver what they say. I once had a barrel maker that had to make 3 barrels before one would match/beat there advertised spec. the other barrels were good but just not good enough to meet there #1 barrel tolerances. After building the rifle (A 416 Buffalo) it shot the best group of my life (.034 with a 400 grain bullet). so for me this was conformation that quality and precision of the barrel is paramount if accuracy is the goal and the rest is up to the smith. I have heard stories of barrels that were indexed because of barrel run out, I would consider that barrel to be junk and would never use one or buy another from that maker. I am not good enough to turn carbon into diamonds, so I demand the best I can get and wont compromise my standards. (I need all the help I can get). J E CUSTOM [/QUOTE]
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Why dial a rifle bore within .0001"
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