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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: 1976562" data-attributes="member: 112048"><p>Its204fast: This is a fun experiment, and I would like to hear the findings. One thing not mentioned in the responses so far is compression. Gas has inertia, and the denser the gas, the greater the inertia. As the bullet moves down the barrel, the gas resident in the barrel will compress, and resistance will spike. This will have greater effect than the mass of the gas that must be moved. Helium will change the sonic velocity of the compression wave, and the accuracy node of your barrel. Also, rather than using a balloon, tap the gas safety port in the breech and install a threaded check valve (one-way valve) fitting, attach a soft plastic feed line from a helium cylinder and flow regulator, and send a low flow (<5 ltr/min) of helium down the barrel to displace the air. Do not put anything over the muzzle, just let the helium flow through. The flow regulator, fittings, hose and check valve will set you back about $120.</p><p></p><p><a href="https://www.amazon.com/dp/B001C11BP4/?tag=lrhmag19-20" target="_blank">https://www.amazon.com/dp/B001C11BP4/?tag=lrhmag19-20</a></p><p></p><p><a href="https://www.amazon.com/dp/B07RXLLVSQ/?tag=lrhmag19-20" target="_blank">https://www.amazon.com/dp/B07RXLLVSQ/?tag=lrhmag19-20</a></p><p></p><p>I strongly recommend you tie a string to the trigger and fire the gun remotely, until you see what the effects are. I do not think this is particularly dangerous, but anytime you try something new, you get unexpected results or side-effects. In all cases, wear eye protection and use moderate loads. Good luck!</p></blockquote><p></p>
[QUOTE="Calamity, post: 1976562, member: 112048"] Its204fast: This is a fun experiment, and I would like to hear the findings. One thing not mentioned in the responses so far is compression. Gas has inertia, and the denser the gas, the greater the inertia. As the bullet moves down the barrel, the gas resident in the barrel will compress, and resistance will spike. This will have greater effect than the mass of the gas that must be moved. Helium will change the sonic velocity of the compression wave, and the accuracy node of your barrel. Also, rather than using a balloon, tap the gas safety port in the breech and install a threaded check valve (one-way valve) fitting, attach a soft plastic feed line from a helium cylinder and flow regulator, and send a low flow (<5 ltr/min) of helium down the barrel to displace the air. Do not put anything over the muzzle, just let the helium flow through. The flow regulator, fittings, hose and check valve will set you back about $120. [URL]https://www.amazon.com/dp/B001C11BP4/?tag=lrhmag19-20[/URL] [URL]https://www.amazon.com/dp/B07RXLLVSQ/?tag=lrhmag19-20[/URL] I strongly recommend you tie a string to the trigger and fire the gun remotely, until you see what the effects are. I do not think this is particularly dangerous, but anytime you try something new, you get unexpected results or side-effects. In all cases, wear eye protection and use moderate loads. Good luck! [/QUOTE]
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External Ballistics Experiment
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