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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: 1142132" data-attributes="member: 41122"><p>He is getting a solid indicator reading. However what is that reading representing? </p><p></p><p>Range rods only touch the bore in two places about two to three inches apart. </p><p>Again, assuming, its perfectly centered in perfectly fit bushings, the rod is representing a projection of the alignment of the two points in the bore that it is touching. </p><p></p><p>Like any of us that smith is getting the bore running as close as he can with the tools he has. I wont say it is or is not good enough, and i couldnt tell you what kind of accuracy he can obtain like that. </p><p></p><p>My problem with range rods is that you cant see any part of the bore that lies between or beyond those two points. Most chambers are about two inches long, and the bushing on the chamber reamer is going to ride the bore far in front of the reach of his range rod. Also if the face of the barrel isnt square with the bore, and completely burrless the range rod will reflect this. Its very common to indicate a range rod, pull it out, re insert it, and get a different reading. </p><p></p><p>Grizzly rods allow you to indicate any point along the bore thats within reach of the rod. They are about 12" long. They dont project the tolerance, its actually the opposite. The further in you go, you are actually only reading a fraction of what the tip is moving, but you can see any part of the bore over a large span, and a well fit bushing in a good cut bore will usually ride it pretty close. </p><p></p><p>This goes back to my question earlier. </p><p>Would you rather have 4" of a bore run within .0002" or 10" of a bore run within .0005"?</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 1142132, member: 41122"] He is getting a solid indicator reading. However what is that reading representing? Range rods only touch the bore in two places about two to three inches apart. Again, assuming, its perfectly centered in perfectly fit bushings, the rod is representing a projection of the alignment of the two points in the bore that it is touching. Like any of us that smith is getting the bore running as close as he can with the tools he has. I wont say it is or is not good enough, and i couldnt tell you what kind of accuracy he can obtain like that. My problem with range rods is that you cant see any part of the bore that lies between or beyond those two points. Most chambers are about two inches long, and the bushing on the chamber reamer is going to ride the bore far in front of the reach of his range rod. Also if the face of the barrel isnt square with the bore, and completely burrless the range rod will reflect this. Its very common to indicate a range rod, pull it out, re insert it, and get a different reading. Grizzly rods allow you to indicate any point along the bore thats within reach of the rod. They are about 12" long. They dont project the tolerance, its actually the opposite. The further in you go, you are actually only reading a fraction of what the tip is moving, but you can see any part of the bore over a large span, and a well fit bushing in a good cut bore will usually ride it pretty close. This goes back to my question earlier. Would you rather have 4" of a bore run within .0002" or 10" of a bore run within .0005"? [/QUOTE]
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Why dial a rifle bore within .0001"
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