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Rifles, Reloading, Optics, Equipment
Reloading
primer cratering 7mm ultra mag
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<blockquote data-quote="adam" data-source="post: 180657" data-attributes="member: 9382"><p>A little quick math. </p><p>.080" hole (.00503 sq inches) x60,000 PSI = 301.6 lbs</p><p> </p><p>.065" hole (.00332 sq inches) x60,000 psi = 199.1 lbs</p><p> </p><p>Depending on the year of manufacture and which company produced them, most primer cups measure between .019" and .027" thick. </p><p> </p><p>Visualize 300 lbs balanced on a firing pin, pushing on a metal cup roughly the thickness of 2 buisness cards. If you have a combination where you have a thin cup (take away one buisness card thickness) and an .080" hole, it is easy to see where you could get cratering without the other signs of overpressure.</p></blockquote><p></p>
[QUOTE="adam, post: 180657, member: 9382"] A little quick math. .080" hole (.00503 sq inches) x60,000 PSI = 301.6 lbs .065" hole (.00332 sq inches) x60,000 psi = 199.1 lbs Depending on the year of manufacture and which company produced them, most primer cups measure between .019" and .027" thick. Visualize 300 lbs balanced on a firing pin, pushing on a metal cup roughly the thickness of 2 buisness cards. If you have a combination where you have a thin cup (take away one buisness card thickness) and an .080" hole, it is easy to see where you could get cratering without the other signs of overpressure. [/QUOTE]
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primer cratering 7mm ultra mag
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