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Rifles, Reloading, Optics, Equipment
Reloading
Interpreting Pressure Signs from Velocity (260 Remington load dev)
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<blockquote data-quote="1Moose" data-source="post: 1399559" data-attributes="member: 74044"><p>I tested the case head expansion today with 4 cartridges loaded to the same spec that originally started my wondering about potential overpressure given the velocity I was seeing (though no visible signs of pressure from extractor or on primer).</p><ul> <li data-xf-list-type="ul">Hornady 143 ELD-x</li> <li data-xf-list-type="ul">H1000 47.8 grains</li> <li data-xf-list-type="ul">Rem 9.5 primers</li> <li data-xf-list-type="ul">Lapua brass (unfired, ran though FL die and chamfered the inside and outside of the neck)</li> </ul><p>I marked all four cases with sharpee, and marked my calipers as well so I was sure to measure in same place every time. Pre-firing case head measurement was 0.469 inches on all 4 cartridges. Post-firing case head measurement was 0.4695 (also on all 4 cartridges). I was as meticulous as I could be to get the calipers aligned in the exact same spot. So, measured expansion is .0005. Velocity from these four cases averaged 2772 fps, which as a bit higher than this load on my last outing when they averaged 2754 fps. I wanted to be sure to test the expansion and post the results given all the help offered in response to my original post. Thanks!</p></blockquote><p></p>
[QUOTE="1Moose, post: 1399559, member: 74044"] I tested the case head expansion today with 4 cartridges loaded to the same spec that originally started my wondering about potential overpressure given the velocity I was seeing (though no visible signs of pressure from extractor or on primer). [LIST] [*]Hornady 143 ELD-x [*]H1000 47.8 grains [*]Rem 9.5 primers [*]Lapua brass (unfired, ran though FL die and chamfered the inside and outside of the neck) [/LIST] I marked all four cases with sharpee, and marked my calipers as well so I was sure to measure in same place every time. Pre-firing case head measurement was 0.469 inches on all 4 cartridges. Post-firing case head measurement was 0.4695 (also on all 4 cartridges). I was as meticulous as I could be to get the calipers aligned in the exact same spot. So, measured expansion is .0005. Velocity from these four cases averaged 2772 fps, which as a bit higher than this load on my last outing when they averaged 2754 fps. I wanted to be sure to test the expansion and post the results given all the help offered in response to my original post. Thanks! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Interpreting Pressure Signs from Velocity (260 Remington load dev)
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