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Rifles, Reloading, Optics, Equipment
Reloading
Hornady or Sinclair concentricity guage
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<blockquote data-quote="Trickymissfit" data-source="post: 449575" data-attributes="member: 25383"><p>first of all I don't care whatkind of a loading system you use. That's the user's own business.</p><p> </p><p>To put concentricity into the frame of mind we're talking you have to imagine a centerline running thru the exact center axis of the case. Errors are measured off that axis. There's also a "yaw" measurment which tells us just how strait the bullet is seated in the neck (even if the case is dead perfect). When I check a bullet to see how strait it is to the center line axis I will check it just in front of the case rim. Then I'll usually move about 2/3's to 3/4 of the way down the bullet and recheck it. If the high points are in line with each other the bullet is at least strait, but not always centered with the case axis centerline.</p><p> </p><p> Now I'm gonna knock both Hornaday and Sinclair a bit, so take it for what it's worth. They both use a bad indicator setup (to say it's bad is putting it mildly). The gear & rack indicators they are using are built with about 10% lag in them (a term used in gauging that refers to backlash). You can buy jeweled gear & rack indicators that have about 3%, but they also are expensive. The Sinclair uses a cheap ball bearing setup that is actually built to ease moving of a part into a precision locator for precise measurement. These often have anywhere from .0015 to .010 error built into them. They do make a super precision version that cost more than their gauge per block. There is a much better way to do this for about twenty dollars a bearing pack (I won't say here). There's also a problem with the Sinclair in axis alignment that will actually cause error. Of the two I like the Hornaday better after I throw their dial indicator in the trash can </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 449575, member: 25383"] first of all I don't care whatkind of a loading system you use. That's the user's own business. To put concentricity into the frame of mind we're talking you have to imagine a centerline running thru the exact center axis of the case. Errors are measured off that axis. There's also a "yaw" measurment which tells us just how strait the bullet is seated in the neck (even if the case is dead perfect). When I check a bullet to see how strait it is to the center line axis I will check it just in front of the case rim. Then I'll usually move about 2/3's to 3/4 of the way down the bullet and recheck it. If the high points are in line with each other the bullet is at least strait, but not always centered with the case axis centerline. Now I'm gonna knock both Hornaday and Sinclair a bit, so take it for what it's worth. They both use a bad indicator setup (to say it's bad is putting it mildly). The gear & rack indicators they are using are built with about 10% lag in them (a term used in gauging that refers to backlash). You can buy jeweled gear & rack indicators that have about 3%, but they also are expensive. The Sinclair uses a cheap ball bearing setup that is actually built to ease moving of a part into a precision locator for precise measurement. These often have anywhere from .0015 to .010 error built into them. They do make a super precision version that cost more than their gauge per block. There is a much better way to do this for about twenty dollars a bearing pack (I won't say here). There's also a problem with the Sinclair in axis alignment that will actually cause error. Of the two I like the Hornaday better after I throw their dial indicator in the trash can gary [/QUOTE]
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Reloading
Hornady or Sinclair concentricity guage
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