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Rifles, Reloading, Optics, Equipment
Reloading
300wm rl26 help with pressure signs
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<blockquote data-quote="Pdvdh" data-source="post: 1121773" data-attributes="member: 4191"><p>What I <strong>believe</strong>, and have demonstrated for many years, is that I can measure belt and case head expansion of 0.0005" with dial calipers graduated to 0.001". If you had measured case head expansion for any length of time, you would have arrived at the same conclusion. And that's why I corrected your errant statement on the need for a 0.0001" blade micrometer. </p><p></p><p>Never said a pressure trace wouldn't be a better way to identify pressure. Neither did you, until now.</p><p></p><p>I also believe I won't damage any modern rifle if my belt or case head expansion is held to less than 0.0005" expansion on the original shot fired on the virgin <u>brass</u> cases. And that I'll always identify pressure with this method, before the one you recommend: stiff bolt lift. </p><p></p><p>Stiff bolt lift will be reached at different pressures with different actions, more so than the variability of brass case head / belt expansion. So why you recommend stiff bolt lift, preferentially to belt / case head measurements is a mystery to yourself. Some custom actions won't exhibit stiff bolt lift until pressures are way higher than stiff bolt lift occurs with a Remington 700 or Win M70. The brass used to manufacture casings, although not identical between manufacturers, is still more consistent (with less variability) than the spectrum of actions manufactured and sold. </p><p></p><p>Brass case expansion to the point of failure is the safety relief valve on overpressured cartridges. When the pressure gets too high, the pressure will be released at the case head/primer, before the steel action lets loose (on the majority reloading errors and overloads). Measuring case head expansion or belt expansion allows one to measure and detect overpressure way before the safety relief valve opens.</p><p></p><p>If you or Denton disagree with these FACTS, it's a free country and everyone is allowed to be wrong.</p><p></p><p>If you want to claim pressure trace is better than measuring belt / case head expansion, I would hope you're correct, based on the cost of pressure trace.</p><p></p><p>When you claim one needs a 0.0001" calibrated measuring instrument to measure 0.0005" belt / case head expansion, you're wrong.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1121773, member: 4191"] What I [B]believe[/B], and have demonstrated for many years, is that I can measure belt and case head expansion of 0.0005" with dial calipers graduated to 0.001". If you had measured case head expansion for any length of time, you would have arrived at the same conclusion. And that's why I corrected your errant statement on the need for a 0.0001" blade micrometer. Never said a pressure trace wouldn't be a better way to identify pressure. Neither did you, until now. I also believe I won't damage any modern rifle if my belt or case head expansion is held to less than 0.0005" expansion on the original shot fired on the virgin [U]brass[/U] cases. And that I'll always identify pressure with this method, before the one you recommend: stiff bolt lift. Stiff bolt lift will be reached at different pressures with different actions, more so than the variability of brass case head / belt expansion. So why you recommend stiff bolt lift, preferentially to belt / case head measurements is a mystery to yourself. Some custom actions won't exhibit stiff bolt lift until pressures are way higher than stiff bolt lift occurs with a Remington 700 or Win M70. The brass used to manufacture casings, although not identical between manufacturers, is still more consistent (with less variability) than the spectrum of actions manufactured and sold. Brass case expansion to the point of failure is the safety relief valve on overpressured cartridges. When the pressure gets too high, the pressure will be released at the case head/primer, before the steel action lets loose (on the majority reloading errors and overloads). Measuring case head expansion or belt expansion allows one to measure and detect overpressure way before the safety relief valve opens. If you or Denton disagree with these FACTS, it's a free country and everyone is allowed to be wrong. If you want to claim pressure trace is better than measuring belt / case head expansion, I would hope you're correct, based on the cost of pressure trace. When you claim one needs a 0.0001" calibrated measuring instrument to measure 0.0005" belt / case head expansion, you're wrong. [/QUOTE]
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300wm rl26 help with pressure signs
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