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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity:How much ?
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<blockquote data-quote="TnTom" data-source="post: 362573" data-attributes="member: 21944"><p>AS JE pointed out to gage the difference between .001 and .0005 wall thickness could get a little hard to determine, and you gotta draw the line somewhere. </p><p></p><p>I think there is sometimes over emphasis on the run out issue when so many other variables enter into good groups but it still it cant be ignored. </p><p></p><p>Minimizing the bullet press force I have found helps me to keep r/o minimal and I do that by making sure my cases are properly annelled and interfernce is between than .0015 and .002.</p><p></p><p>I have found that the neck seems to get a little kinked when work hardening is present and can make the bullet harder to press especially if the interference become .003" or more. It doesnt take much in the area of the neck being slightly tweeked or deformed to exaggerate the r/o. If the necks are pliable, clean and the walls are relatively uniform the bullet slips in smoothly and its measurable when chronographing and grouping. I get my most uniform loads when I assure those 3 things occur during my reloading..</p><p></p><p>...and as far as wall thickness goes I'm not spending more tha a moment to assure myself its not getting greater than .001 /.0015 or so as thats as close as you can measure with a degree of accuracy without getting into mics than have a resolution into the .0001 - .0005 or greater range and thats really getting expensive (for many of us). You can do it with a dial indicator and mandrel but still the indicator needs a resolution of 10 to 1 to resolve measurement less than .001" and most indicator I see on reloading benchs run in the .001" resolution increment. I have indicators that resolve to .00005 but there very sensitive and almost usless in reloading.</p><p></p><p>If your instrument reports in .001" increments you can feel confident of reading between the .001 and .002" range. </p><p></p><p>I suggest turning or dusting off if it appears that your getting around .002 and greater and you do not have to have a 360 deg cleaning when turning of the surface to to move a .003" wall thickness to .0015.</p></blockquote><p></p>
[QUOTE="TnTom, post: 362573, member: 21944"] AS JE pointed out to gage the difference between .001 and .0005 wall thickness could get a little hard to determine, and you gotta draw the line somewhere. I think there is sometimes over emphasis on the run out issue when so many other variables enter into good groups but it still it cant be ignored. Minimizing the bullet press force I have found helps me to keep r/o minimal and I do that by making sure my cases are properly annelled and interfernce is between than .0015 and .002. I have found that the neck seems to get a little kinked when work hardening is present and can make the bullet harder to press especially if the interference become .003" or more. It doesnt take much in the area of the neck being slightly tweeked or deformed to exaggerate the r/o. If the necks are pliable, clean and the walls are relatively uniform the bullet slips in smoothly and its measurable when chronographing and grouping. I get my most uniform loads when I assure those 3 things occur during my reloading.. ...and as far as wall thickness goes I'm not spending more tha a moment to assure myself its not getting greater than .001 /.0015 or so as thats as close as you can measure with a degree of accuracy without getting into mics than have a resolution into the .0001 - .0005 or greater range and thats really getting expensive (for many of us). You can do it with a dial indicator and mandrel but still the indicator needs a resolution of 10 to 1 to resolve measurement less than .001" and most indicator I see on reloading benchs run in the .001" resolution increment. I have indicators that resolve to .00005 but there very sensitive and almost usless in reloading. If your instrument reports in .001" increments you can feel confident of reading between the .001 and .002" range. I suggest turning or dusting off if it appears that your getting around .002 and greater and you do not have to have a 360 deg cleaning when turning of the surface to to move a .003" wall thickness to .0015. [/QUOTE]
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Concentricity:How much ?
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