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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs well above max load?
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<blockquote data-quote="Jeffpatton00" data-source="post: 2332211" data-attributes="member: 97649"><p>I could use some feedback on the pressure signs we see in this image. I'm doing a load workup for my 224 Valkyrie, with these specs:</p><ul> <li data-xf-list-type="ul">30" Bartlein barrel, 5R, progressive twist to 6.5, on AR platform</li> <li data-xf-list-type="ul">SMK 90 grain HPBT</li> <li data-xf-list-type="ul">.020" off lands</li> <li data-xf-list-type="ul">Federal brass, 3x fired</li> <li data-xf-list-type="ul">Vihtavuori N140</li> <li data-xf-list-type="ul">CCI BR4 SR primers</li> </ul><p>VV lists this load data for 90 gr bullets:</p><table style='width: 100%'><tr><td></td><td>Start</td><td>Start</td><td>Max</td><td>Max</td></tr><tr><td></td><td>Grains</td><td>Velocity</td><td>Load</td><td>Velocity</td></tr><tr><td>N140</td><td><div style="text-align: right">21.6</div> </td><td><div style="text-align: right">2329</div> </td><td><div style="text-align: right">23.3</div> </td><td><div style="text-align: right">2516</div> </td></tr></table><p></p><p>All loads show ejector marks at the arrows, and the marks at the higher loads seem no more pronounced than at the lower loads. The primers begin to flatten at 25 gr, but I'm not seeing more signs with the increased loads, maybe you'll see something. </p><p></p><p>While VV's load data shows a max at 23.3gr, the smith who built the gun settled on 25 gr as his recommended load. I want to do my own load development so I'm trying to start with pressure testing, then move to load dev, so that's where things stand so far. I understand some will note that manufacturers tend to report loads on the low side to minimize liability risk.</p><p></p><p>Now, as an engineer I do understand statistical analysis, but the groups do give the appearance of tightening as the load increases. All things being equal, I might try to find a note in the neighborhood of 25.6 gr, but given the flattened primers, is that discouraged? </p><p></p><p>What thoughts do folks have?</p><p></p><p>[ATTACH=full]309933[/ATTACH]</p></blockquote><p></p>
[QUOTE="Jeffpatton00, post: 2332211, member: 97649"] I could use some feedback on the pressure signs we see in this image. I'm doing a load workup for my 224 Valkyrie, with these specs: [LIST] [*]30" Bartlein barrel, 5R, progressive twist to 6.5, on AR platform [*]SMK 90 grain HPBT [*].020" off lands [*]Federal brass, 3x fired [*]Vihtavuori N140 [*]CCI BR4 SR primers [/LIST] VV lists this load data for 90 gr bullets: [TABLE] [TR] [TD][/TD] [TD]Start[/TD] [TD]Start[/TD] [TD]Max[/TD] [TD]Max[/TD] [/TR] [TR] [TD][/TD] [TD]Grains[/TD] [TD]Velocity[/TD] [TD]Load[/TD] [TD]Velocity[/TD] [/TR] [TR] [TD]N140[/TD] [TD][RIGHT]21.6[/RIGHT][/TD] [TD][RIGHT]2329[/RIGHT][/TD] [TD][RIGHT]23.3[/RIGHT][/TD] [TD][RIGHT]2516[/RIGHT][/TD] [/TR] [/TABLE] All loads show ejector marks at the arrows, and the marks at the higher loads seem no more pronounced than at the lower loads. The primers begin to flatten at 25 gr, but I'm not seeing more signs with the increased loads, maybe you'll see something. While VV's load data shows a max at 23.3gr, the smith who built the gun settled on 25 gr as his recommended load. I want to do my own load development so I'm trying to start with pressure testing, then move to load dev, so that's where things stand so far. I understand some will note that manufacturers tend to report loads on the low side to minimize liability risk. Now, as an engineer I do understand statistical analysis, but the groups do give the appearance of tightening as the load increases. All things being equal, I might try to find a note in the neighborhood of 25.6 gr, but given the flattened primers, is that discouraged? What thoughts do folks have? [ATTACH type="full"]309933[/ATTACH] [/QUOTE]
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Pressure signs well above max load?
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