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Where does peak pressure occur
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<blockquote data-quote="royinidaho" data-source="post: 168006" data-attributes="member: 2011"><p>winmagman,</p><p></p><p>From messing around with the RSI Pressure trace gizmo, jumping the bullet or seating it into the lands makes no difference in peak pressure. Seating the bullet into the rifling seems to tend to increase the initial pressure giving a larger area under the entire curve which means more energy transferred to the bullet. Peak pressure is about in the same ball park for both conditions.</p><p></p><p>For a 150gr 30cal bullet w/a MV of 2900 the bullets leaves the barrel in about 1.2 milliseconds. Peak pressure occurs at about the 0.4 millisecond mark or about 1/3rd of 1.2 barrel time. Very roughly speaking this somewhere around the 8" down the barrel mark.</p><p></p><p>Once I get back to pressure testing I'll post some pressure traces. Right now my laptop used for traces isn't up to snuff software wise to transfer the traces into picture format.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /></p><p></p><p>Also pressure never appears to drop. It slows in its rise as thing begin to move but never drops. Also nanoseconds are way to small of a unit for this stuff. It just ain't that fast.</p><p></p><p>Also I have no idea of where in the barrel the bullet achieves its maximum velocity. I just assume its at the muzzle.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /></p></blockquote><p></p>
[QUOTE="royinidaho, post: 168006, member: 2011"] winmagman, From messing around with the RSI Pressure trace gizmo, jumping the bullet or seating it into the lands makes no difference in peak pressure. Seating the bullet into the rifling seems to tend to increase the initial pressure giving a larger area under the entire curve which means more energy transferred to the bullet. Peak pressure is about in the same ball park for both conditions. For a 150gr 30cal bullet w/a MV of 2900 the bullets leaves the barrel in about 1.2 milliseconds. Peak pressure occurs at about the 0.4 millisecond mark or about 1/3rd of 1.2 barrel time. Very roughly speaking this somewhere around the 8" down the barrel mark. Once I get back to pressure testing I'll post some pressure traces. Right now my laptop used for traces isn't up to snuff software wise to transfer the traces into picture format.:o Also pressure never appears to drop. It slows in its rise as thing begin to move but never drops. Also nanoseconds are way to small of a unit for this stuff. It just ain't that fast. Also I have no idea of where in the barrel the bullet achieves its maximum velocity. I just assume its at the muzzle.:confused: [/QUOTE]
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