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Rifles, Reloading, Optics, Equipment
Reloading
weighing bullets
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<blockquote data-quote="Bart B" data-source="post: 107518" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>The trouble with ustng a ball mic, as I see it, is measuring each jacket at the same place. I also doubt the accuracy when using a steel ball on a copper jacket. This is critical when looking for variations in "tenths". </p><p></p><p>[/ QUOTE ]Some years ago, a couple of us were using a steel-balled mic to measure some 30 caliber J4 jackets to make some 168-gr. hollow point bullets in Rorschach carbide dies. We also used a precision tubing mic with a round anvil. Both had torque limiting thimbles. Repeatability was well below .0001-inch with both measuring every 90 degrees about 3/8ths inch into each one, so I don't think the softer jackets let the round steel ball dent them enough to matter. If one doesn't use a torque-limiting micrometer, then chances are the steel ball could dimple the inside of the jacket. We gotta be careful doing such things.</p></blockquote><p></p>
[QUOTE="Bart B, post: 107518, member: 5302"] [ QUOTE ] The trouble with ustng a ball mic, as I see it, is measuring each jacket at the same place. I also doubt the accuracy when using a steel ball on a copper jacket. This is critical when looking for variations in "tenths". [/ QUOTE ]Some years ago, a couple of us were using a steel-balled mic to measure some 30 caliber J4 jackets to make some 168-gr. hollow point bullets in Rorschach carbide dies. We also used a precision tubing mic with a round anvil. Both had torque limiting thimbles. Repeatability was well below .0001-inch with both measuring every 90 degrees about 3/8ths inch into each one, so I don't think the softer jackets let the round steel ball dent them enough to matter. If one doesn't use a torque-limiting micrometer, then chances are the steel ball could dimple the inside of the jacket. We gotta be careful doing such things. [/QUOTE]
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