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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="MagnumManiac" data-source="post: 1395646" data-attributes="member: 10755"><p>What you need to look for in regard to watching velocity is whether a single increase in powder tracks the same as the previous increase.</p><p>If say a 1gr increase from the start load increases velocity by 30fps, then subsequent loads do the same, then just as you hit max load, the velocity jumps 100fps, then max pressure has most LIKELY been exceeded. I have tested loads that would increase exponentially for 3gr then the next 3gr would be 100fps faster and track normally with a 30fps increase per charge weight.</p><p>Some say that if you exceed book velocity then you have exceeded max pressure, well, this is not what I have seen using a pressure trace. A loose bore will yield higher velocity at less pressure and vice versa.</p><p>You just need to know that a sudden sharp increase in velocity may be a cause of exceeding max pressure and, if you keep increasing the powder charge, it may actually stop increasing and actually decrease.</p><p>I find ejector marks are the first sign followed by flattened primers in SOME brands. Not all primer brands show up flattening until you are way past safe loads.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1395646, member: 10755"] What you need to look for in regard to watching velocity is whether a single increase in powder tracks the same as the previous increase. If say a 1gr increase from the start load increases velocity by 30fps, then subsequent loads do the same, then just as you hit max load, the velocity jumps 100fps, then max pressure has most LIKELY been exceeded. I have tested loads that would increase exponentially for 3gr then the next 3gr would be 100fps faster and track normally with a 30fps increase per charge weight. Some say that if you exceed book velocity then you have exceeded max pressure, well, this is not what I have seen using a pressure trace. A loose bore will yield higher velocity at less pressure and vice versa. You just need to know that a sudden sharp increase in velocity may be a cause of exceeding max pressure and, if you keep increasing the powder charge, it may actually stop increasing and actually decrease. I find ejector marks are the first sign followed by flattened primers in SOME brands. Not all primer brands show up flattening until you are way past safe loads. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Interpreting Pressure Signs from Velocity (260 Remington load dev)
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