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Is Velocity 'always' a good indication of pressure?
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<blockquote data-quote="Fiftydriver" data-source="post: 73419" data-attributes="member: 10"><p><strong>Re: Is Velocity \'always\' a good indication of pressure?</strong></p><p></p><p>Roy,</p><p></p><p>What LB says is true, but, if you are using appropriate powders you can certainly rely on velocity to keep you out of pressure problems.</p><p></p><p>What youhave occuring though is not possible to relate to velocity comparisions because there are to many variables in your equation.</p><p></p><p>First off, your using two different powders which will react differently in pressure and velocity.</p><p></p><p>Also your using two different brands of bullets that will vary in jacket thickness, core hardness and baring surface length.</p><p></p><p>Finally you are comparing differnt bullet weights. While you would imagine the heavier bullets to produce more pressure, youare using a slower powder with a softer, thinner jacketed bullet in the Sierra.</p><p></p><p>So to answer your question, yes, for a given set of standards, velocity is a very accurate product of pressure but do not assume that it is consistant when you change so many variables.</p><p></p><p>To be honest, try RL-22 in your 225 gr load and see what happens. I suspect it has more to do with the burn rate of the powders then anything.</p><p></p><p>You just can not compare different powders and different bullets and different bullet weights, to many variables in the equation and they all produce different pressures curves, sometimes dramatically different.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 73419, member: 10"] [b]Re: Is Velocity \'always\' a good indication of pressure?[/b] Roy, What LB says is true, but, if you are using appropriate powders you can certainly rely on velocity to keep you out of pressure problems. What youhave occuring though is not possible to relate to velocity comparisions because there are to many variables in your equation. First off, your using two different powders which will react differently in pressure and velocity. Also your using two different brands of bullets that will vary in jacket thickness, core hardness and baring surface length. Finally you are comparing differnt bullet weights. While you would imagine the heavier bullets to produce more pressure, youare using a slower powder with a softer, thinner jacketed bullet in the Sierra. So to answer your question, yes, for a given set of standards, velocity is a very accurate product of pressure but do not assume that it is consistant when you change so many variables. To be honest, try RL-22 in your 225 gr load and see what happens. I suspect it has more to do with the burn rate of the powders then anything. You just can not compare different powders and different bullets and different bullet weights, to many variables in the equation and they all produce different pressures curves, sometimes dramatically different. Good Shooting!! Kirby Allen(50) [/QUOTE]
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