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Rifles, Reloading, Optics, Equipment
Reloading
Known Loads too hot now..why
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<blockquote data-quote="jwp475" data-source="post: 385139" data-attributes="member: 3776"><p>Sloping cases have more bolt thrust than cases with less body taper, P O Ackley proved this years ago. Of course any lubrication on a case will have more bolt thrust, that is a given. You even stated ealier in this thread that as long as SAAMI spec pressures are not exceeded that all is fine.</p><p></p><p> </p><p>Episode 51: Myths Reopened</p><p>•You can fire a bullet from a rifle or handgun underwater: confirmed. A 9mm or .357 magnum would be lethal at 2ft.</p><p></p><p></p><p> Here is another test of firing a pistol under water</p><p></p><p></p><p>Some Comments on Shooting Underwater</p><p></p><p>What would happen if someone fired a rifle underwater? Would the pressure produced rupture the gun? It is assumed under these conditions that the barrel and action are completely submerged and the barrel is full of water. </p><p></p><p>To get an answer to this question the NRA performed a number of underwater experiments. In the first experiment the bullet and powder charge were removed from a .45 ACP cartridge and the primer flash hole was covered with a waterproof disk to keep water out of the primer. The gun was loaded with the primed cartridge and held vertically while the barrel was filled with water. Without changing the gun position the gun was fired. There was the sound of a mild 'splat' as the water was blown up against the ceiling. The gun was not damaged.</p><p></p><p>Next the gun was loaded with another primed cartridge and the fully submerged gun was fired. No noise could be heard, but a spurt of black water was ejected from the muzzle of the gun for a distance of about one-foot. Reassured that the gun mechanism would work underwater, the gun was loaded with a Service ball cartridge and fastened in a heavy vice on the bottom of a tank. The tank measured 40"x24"x24" and was filled with water. Care was taken that the barrel was filled with water and had no air pockets. On firing (by remote control) there was a lot of disturbance and quite a bit of water splashed out of the tank. The bullet passed through 16" of water, a 7/8" pine board, 6" more of water and finally came to rest against a second board after making a deep dent in it. The empty cartridge was not ejected, but jammed with the pistol slide part way open and the cartridge caught in the ejection port. The pistol was not damaged in any way.</p></blockquote><p></p>
[QUOTE="jwp475, post: 385139, member: 3776"] Sloping cases have more bolt thrust than cases with less body taper, P O Ackley proved this years ago. Of course any lubrication on a case will have more bolt thrust, that is a given. You even stated ealier in this thread that as long as SAAMI spec pressures are not exceeded that all is fine. Episode 51: Myths Reopened •You can fire a bullet from a rifle or handgun underwater: confirmed. A 9mm or .357 magnum would be lethal at 2ft. Here is another test of firing a pistol under water Some Comments on Shooting Underwater What would happen if someone fired a rifle underwater? Would the pressure produced rupture the gun? It is assumed under these conditions that the barrel and action are completely submerged and the barrel is full of water. To get an answer to this question the NRA performed a number of underwater experiments. In the first experiment the bullet and powder charge were removed from a .45 ACP cartridge and the primer flash hole was covered with a waterproof disk to keep water out of the primer. The gun was loaded with the primed cartridge and held vertically while the barrel was filled with water. Without changing the gun position the gun was fired. There was the sound of a mild ‘splat’ as the water was blown up against the ceiling. The gun was not damaged. Next the gun was loaded with another primed cartridge and the fully submerged gun was fired. No noise could be heard, but a spurt of black water was ejected from the muzzle of the gun for a distance of about one-foot. Reassured that the gun mechanism would work underwater, the gun was loaded with a Service ball cartridge and fastened in a heavy vice on the bottom of a tank. The tank measured 40"x24"x24" and was filled with water. Care was taken that the barrel was filled with water and had no air pockets. On firing (by remote control) there was a lot of disturbance and quite a bit of water splashed out of the tank. The bullet passed through 16" of water, a 7/8" pine board, 6" more of water and finally came to rest against a second board after making a deep dent in it. The empty cartridge was not ejected, but jammed with the pistol slide part way open and the cartridge caught in the ejection port. The pistol was not damaged in any way. [/QUOTE]
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Known Loads too hot now..why
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