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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension-- how much ???
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<blockquote data-quote="woods" data-source="post: 374028" data-attributes="member: 6042"><p>I agree with boomtube, I have done the test and measured with pin gauges accurate to within .001". I sized necks from a 264 caliber case with 3 different size mandrels </p><p></p><p>mandrel size / # fired case / sized case pin size / pulled bullet pin size</p><p>.262" mandrel / 5 times fired / .263" / .263"</p><p>.262" mandrel / 1 time fired / .262" / .263"</p><p>------------------------------------------------</p><p>.261" mandrel / 5 times fired / .261" / .263"</p><p>.261" mandrel / 1 time fired / .261" / .263"</p><p>------------------------------------------------</p><p>.260" mandrel / 5 times fired / .260" / .263"</p><p>.260" mandrel / 1 times fired / .260" / .263"</p><p></p><p>notice the pulled bullet pin size was the same. So I size all ID's to .003" below caliber to make sure I get consistant stretching of the brass and go from there. Other than crimping, I don't think you could get any more bullet grip even if you sized the ID down to .010" below caliber. </p><p></p><p>Now there is another factor in bullet grip other than ID and that would be the surface interface of the bullet and the inside of the neck. Imagine the inside of the neck having multiple scratches and burrs as opposed to a completely smooth inside neck surface that was coated with a dry lubricant like graphite or mica. IMO there would be a difference in the amount of force needed to pull the bullet.</p></blockquote><p></p>
[QUOTE="woods, post: 374028, member: 6042"] I agree with boomtube, I have done the test and measured with pin gauges accurate to within .001". I sized necks from a 264 caliber case with 3 different size mandrels mandrel size / # fired case / sized case pin size / pulled bullet pin size .262" mandrel / 5 times fired / .263" / .263" .262" mandrel / 1 time fired / .262" / .263" ------------------------------------------------ .261" mandrel / 5 times fired / .261" / .263" .261" mandrel / 1 time fired / .261" / .263" ------------------------------------------------ .260" mandrel / 5 times fired / .260" / .263" .260" mandrel / 1 times fired / .260" / .263" notice the pulled bullet pin size was the same. So I size all ID's to .003" below caliber to make sure I get consistant stretching of the brass and go from there. Other than crimping, I don't think you could get any more bullet grip even if you sized the ID down to .010" below caliber. Now there is another factor in bullet grip other than ID and that would be the surface interface of the bullet and the inside of the neck. Imagine the inside of the neck having multiple scratches and burrs as opposed to a completely smooth inside neck surface that was coated with a dry lubricant like graphite or mica. IMO there would be a difference in the amount of force needed to pull the bullet. [/QUOTE]
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Neck tension-- how much ???
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