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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs/chronographing
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<blockquote data-quote="boomtube" data-source="post: 205963" data-attributes="member: 9215"><p>Unfortunately, velocity can be a poor indicator of peak pressure and that's the kind that makes guns come from together, especially so if the powder is too fast for the load. Like, a very low velocity would come at a very dangerous pressure with a charge of Bullseye. Yeah, that's a pretty extreme example but I use it to illustrate the principle that we really can't be sure of the pressures by simply recording the velocity.</p><p> </p><p>In my experience, increases in velocity (in rifles) tends to flatten as charges exceed normal levels; pressure quickly goes way up for little or no velocity gain. That's what makes attempts to gain more velocity by simply cramming in more powder so dangerous. BUT - if you have attained the published velocity BEFORE reaching the book max for a normal powder, that IS a good sign you have reached the full standard pressure, so stop there!</p><p> </p><p>Best to stick with case observations and bolt lift to judge pressure, IMHO. But back off at least 5% if you see any of those signs, they are for sure indications of being far over max.</p></blockquote><p></p>
[QUOTE="boomtube, post: 205963, member: 9215"] Unfortunately, velocity can be a poor indicator of peak pressure and that's the kind that makes guns come from together, especially so if the powder is too fast for the load. Like, a very low velocity would come at a very dangerous pressure with a charge of Bullseye. Yeah, that's a pretty extreme example but I use it to illustrate the principle that we really can't be sure of the pressures by simply recording the velocity. In my experience, increases in velocity (in rifles) tends to flatten as charges exceed normal levels; pressure quickly goes way up for little or no velocity gain. That's what makes attempts to gain more velocity by simply cramming in more powder so dangerous. BUT - if you have attained the published velocity BEFORE reaching the book max for a normal powder, that IS a good sign you have reached the full standard pressure, so stop there! Best to stick with case observations and bolt lift to judge pressure, IMHO. But back off at least 5% if you see any of those signs, they are for sure indications of being far over max. [/QUOTE]
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Pressure signs/chronographing
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