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Rifles, Reloading, Optics, Equipment
Reloading
Ejector marks and pressure
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<blockquote data-quote="MagnumManiac" data-source="post: 1209228" data-attributes="member: 10755"><p>Ejector marks, even slight marks, are a sign that brass is 'flowing' at that pressure level. If brass is flowing, the solid head will also be expanding causing primer pockets to enlarge. This expansion may only be .0002"-.0005", but, if continued at this level, primer pockets will be too large after 2-3 firings.</p><p></p><p>The ACTUAL pressure is not important, it's the brass cases ability to withstand the pressure level that counts.</p><p>Primer appearance means little. I have noted many times that ejector marks appear way before primers flatten in certain brands, and others flatten with no ejector marks or hard bolt lift.</p><p></p><p>It must be understood that soft brass expands at lower pressure than harder brass.</p><p>I've had factory loaded Federal cases have ejector marks and enlarged primer pockets on firing them with factory loads. It is soft brass.</p><p></p><p>Hope this helps.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1209228, member: 10755"] Ejector marks, even slight marks, are a sign that brass is 'flowing' at that pressure level. If brass is flowing, the solid head will also be expanding causing primer pockets to enlarge. This expansion may only be .0002"-.0005", but, if continued at this level, primer pockets will be too large after 2-3 firings. The ACTUAL pressure is not important, it's the brass cases ability to withstand the pressure level that counts. Primer appearance means little. I have noted many times that ejector marks appear way before primers flatten in certain brands, and others flatten with no ejector marks or hard bolt lift. It must be understood that soft brass expands at lower pressure than harder brass. I've had factory loaded Federal cases have ejector marks and enlarged primer pockets on firing them with factory loads. It is soft brass. Hope this helps. Cheers. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ejector marks and pressure
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