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Rifles, Reloading, Optics, Equipment
Reloading
Primer backout problems
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<blockquote data-quote="ricka0" data-source="post: 81832" data-attributes="member: 3086"><p>[ QUOTE ]</p><p> <font color="purple"> <strong>I would love to see a test design on this, as there is no doubt that you are creating an incredible amount of bolt thrust. Meaning the case is not able to grip the walls of the chamber, so the entire case is able to push back against the bolt face with much more thrust than is normal. With a heavy load, this "Has the potential" to be a disaster. </strong> </font> </p><p></p><p>[/ QUOTE ]</p><p></p><p>There is (at least an excellent FE model) (My area of mathematics).</p><p></p><p>.243 Win </p><p>Coefficient of friction u = 0.55 (Very rough chamber, rough reamer finish) Maximum bolt load = 4435 lbs Radial thinning near the base = 0.006504"</p><p>Coefficient of friction u = 0.11 (Probably not possible: Polished chamber, polished brass with grease) Maximum bolt load = 4787 lbs Radial thinning near the base = 0.004481"</p><p></p><p> <a href="http://www.varmintal.com/a243z.htm" target="_blank">Finite Element Analysis of Rifle Chamber Surface Finish and how the resulting friction effects brass cartridge case stretching and bolt face loading.</a></p></blockquote><p></p>
[QUOTE="ricka0, post: 81832, member: 3086"] [ QUOTE ] <font color="purple"> [b]I would love to see a test design on this, as there is no doubt that you are creating an incredible amount of bolt thrust. Meaning the case is not able to grip the walls of the chamber, so the entire case is able to push back against the bolt face with much more thrust than is normal. With a heavy load, this "Has the potential" to be a disaster. [/b] </font> [/ QUOTE ] There is (at least an excellent FE model) (My area of mathematics). .243 Win Coefficient of friction u = 0.55 (Very rough chamber, rough reamer finish) Maximum bolt load = 4435 lbs Radial thinning near the base = 0.006504" Coefficient of friction u = 0.11 (Probably not possible: Polished chamber, polished brass with grease) Maximum bolt load = 4787 lbs Radial thinning near the base = 0.004481" [url="http://www.varmintal.com/a243z.htm"]Finite Element Analysis of Rifle Chamber Surface Finish and how the resulting friction effects brass cartridge case stretching and bolt face loading.[/url] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Primer backout problems
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