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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
External Ballistics Experiment
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<blockquote data-quote="Calamity" data-source="post: 1983486" data-attributes="member: 112048"><p>You may be confusing the static pressure in the open bore with the dynamic pressure generated by the cartridge. When the gun is fired, the pressure generated by the powder behind the bullet may be somewhat less, due to less resistance in front of the bullet, but I suspect that it can be less only if the bullet moves down the bore faster. The powder has a fixed burn rate and pressure rise time not effected by the gas in front of the bullet, except for the resistance of the bullet to move. Does that make sense? As for the check valve, it is to prevent the 60,000 psi chamber pressure when the cartidge goes off, from going back up the hose to the helium bottle. Just to avoid losing and eye or some other body part, maybe this should remain just a thought experiment.</p></blockquote><p></p>
[QUOTE="Calamity, post: 1983486, member: 112048"] You may be confusing the static pressure in the open bore with the dynamic pressure generated by the cartridge. When the gun is fired, the pressure generated by the powder behind the bullet may be somewhat less, due to less resistance in front of the bullet, but I suspect that it can be less only if the bullet moves down the bore faster. The powder has a fixed burn rate and pressure rise time not effected by the gas in front of the bullet, except for the resistance of the bullet to move. Does that make sense? As for the check valve, it is to prevent the 60,000 psi chamber pressure when the cartidge goes off, from going back up the hose to the helium bottle. Just to avoid losing and eye or some other body part, maybe this should remain just a thought experiment. [/QUOTE]
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External Ballistics Experiment
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