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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pressure question
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<blockquote data-quote="Idaho Trecker" data-source="post: 944790" data-attributes="member: 67706"><p>I recently did some pressure tests in my 300 Dakota and had some questions about how different powders exhibit different pressure signs. For the tests the same primer was used (CCI 250) but powder was different and I am seeing different signs. With one string I was loading with RL33 and the other with Retumbo. The primers on the 33 string were not flattening or cratering when below what I am assuming is max but when I started going over the "max" the primers started to flatten considerably but never cratered or flowed over. On the Retumbo string the primers were perfect until "max" then started to crater but never flatten. As the charge increased the cratering got worse but never flattened. </p><p></p><p>Does the burn rate or time of pressure peak determine the pressure signs seen on the primer? </p><p></p><p>Any thoughts why the signs are totally different when using the different powders?</p><p></p><p>Do you think I am reaching my "max" pressure with these signs?</p><p></p><p>Thanks for any input</p></blockquote><p></p>
[QUOTE="Idaho Trecker, post: 944790, member: 67706"] I recently did some pressure tests in my 300 Dakota and had some questions about how different powders exhibit different pressure signs. For the tests the same primer was used (CCI 250) but powder was different and I am seeing different signs. With one string I was loading with RL33 and the other with Retumbo. The primers on the 33 string were not flattening or cratering when below what I am assuming is max but when I started going over the "max" the primers started to flatten considerably but never cratered or flowed over. On the Retumbo string the primers were perfect until "max" then started to crater but never flatten. As the charge increased the cratering got worse but never flattened. Does the burn rate or time of pressure peak determine the pressure signs seen on the primer? Any thoughts why the signs are totally different when using the different powders? Do you think I am reaching my "max" pressure with these signs? Thanks for any input [/QUOTE]
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Pressure question
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