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Rifles, Reloading, Optics, Equipment
Reloading
Using chronograph data to determine the best load????
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<blockquote data-quote="green 788" data-source="post: 93015" data-attributes="member: 3781"><p>Derek,</p><p></p><p>I'm not going to vehemently assert that this is fact. It appears to have been the case from my own observations in the past--especially with pistols--but those are isolated issues, admittedly.</p><p></p><p>An old engineering trick, when trying to understand what the reaction to some small change might be, is to mentally exaggerate the change. This in turn often sheds some light on what is likely to happen.</p><p></p><p>I once debated a guy who claimed that faster barrel twists would not cause increased chamber pressures. I asked him how a 1:2 twist might affect pressure, and he quickly back peddled, saying something like "within normal twist offerings chamber pressure differences won't be noticed." But I believe that he finally conceded that faster twists would--to at least some degree--increase chamber pressures when all else was equal.</p><p></p><p>But as to the free-recoil, firm hold and its relation to MV...</p><p></p><p>If the rifle moves back at about 4 feet per second (which would seem nominal), how might that affect muzzle velocity? How much energy does it take to propel a 9 pound rifle backward at 4 feet per second? And how much might that add to the forward momentum of the bullet?</p><p></p><p>What causes the rifle to move backwards in the first place? Well, it is the force which is pushing against the base of the bullet. If the rifle is prevented from moving backwards, where does that energy go? I would say it is added to the propulsion of the bullet. That's the only place it could go, isn't it?</p><p></p><p>You guys know what... /ubbthreads/images/graemlins/smile.gif I have tomorrow off. Maybe I'll take a couple rifles to the range tomorrow and see what happens. Anyone else have some time and ammo to waste for the cause? /ubbthreads/images/graemlins/laugh.gif</p><p></p><p>Dan</p></blockquote><p></p>
[QUOTE="green 788, post: 93015, member: 3781"] Derek, I'm not going to vehemently assert that this is fact. It appears to have been the case from my own observations in the past--especially with pistols--but those are isolated issues, admittedly. An old engineering trick, when trying to understand what the reaction to some small change might be, is to mentally exaggerate the change. This in turn often sheds some light on what is likely to happen. I once debated a guy who claimed that faster barrel twists would not cause increased chamber pressures. I asked him how a 1:2 twist might affect pressure, and he quickly back peddled, saying something like "within normal twist offerings chamber pressure differences won't be noticed." But I believe that he finally conceded that faster twists would--to at least some degree--increase chamber pressures when all else was equal. But as to the free-recoil, firm hold and its relation to MV... If the rifle moves back at about 4 feet per second (which would seem nominal), how might that affect muzzle velocity? How much energy does it take to propel a 9 pound rifle backward at 4 feet per second? And how much might that add to the forward momentum of the bullet? What causes the rifle to move backwards in the first place? Well, it is the force which is pushing against the base of the bullet. If the rifle is prevented from moving backwards, where does that energy go? I would say it is added to the propulsion of the bullet. That's the only place it could go, isn't it? You guys know what... [img]/ubbthreads/images/graemlins/smile.gif[/img] I have tomorrow off. Maybe I'll take a couple rifles to the range tomorrow and see what happens. Anyone else have some time and ammo to waste for the cause? [img]/ubbthreads/images/graemlins/laugh.gif[/img] Dan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Using chronograph data to determine the best load????
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