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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: 385156" data-attributes="member: 3776"><p>Here is a rifle shot under water</p><p></p><p></p><p></p><p></p><p></p><p>The experiment was continued with a .30-'06 Model 1903A3 Service rifle with the stock removed. The rifle was clamped in a vice on the bottom of a tank and loaded with an M2 Service round containing a 152-gr. bullet. Since there was only 6" of space between the muzzle and the inside of the tank no attempt was made to place anything inside the tank to measure penetration. However, four soft pine boards 7/8" thick were placed outside the end of the tank and in line with the rifle barrel.</p><p></p><p>When the gun was fired (by remote control) the bullet penetrated 6" of water, the 3/64" steel tank wall, all four boards and lodged in a solid oak plank used as a backstop. The bolt could not be opened by hand, but opened easily to a few light taps with a rawhide hammer.</p><p></p><p>The cartridge case, just in front of the cannelure had expanded by about .032 inches and the primer pocket had opened up from the standard .209-inches to .228-inches. The primer was punctured and a small quantity of black smoke was observed to escape from the surface of the water, near the breech, when the gun was fired. The case and primer pocket expansion was greater than those usually seen when a 70,000 p.s.i. high pressure test load is fired from the same type of gun, so the pressure was probably much higher than the 70,000 p.s.i. </p><p></p><p>The rifle bore, full of water, would contain about 385 grs. of water, which is equivalent to adding 2.5 times the normal bullet mass that the powder pressure has to move. In spite of this additional resistance from the water, the rifle showed no bulging of the barrel or other damage</p><p></p><p>While this limited test is interesting and gives you some idea what may happen it is not definitive. The results could be different if the same test were performed with a higher intensity cartridge or one of the magnum cartridges with large case capacity.</p></blockquote><p></p>
[QUOTE="jwp475, post: 385156, member: 3776"] Here is a rifle shot under water The experiment was continued with a .30-’06 Model 1903A3 Service rifle with the stock removed. The rifle was clamped in a vice on the bottom of a tank and loaded with an M2 Service round containing a 152-gr. bullet. Since there was only 6" of space between the muzzle and the inside of the tank no attempt was made to place anything inside the tank to measure penetration. However, four soft pine boards 7/8" thick were placed outside the end of the tank and in line with the rifle barrel. When the gun was fired (by remote control) the bullet penetrated 6" of water, the 3/64" steel tank wall, all four boards and lodged in a solid oak plank used as a backstop. The bolt could not be opened by hand, but opened easily to a few light taps with a rawhide hammer. The cartridge case, just in front of the cannelure had expanded by about .032 inches and the primer pocket had opened up from the standard .209-inches to .228-inches. The primer was punctured and a small quantity of black smoke was observed to escape from the surface of the water, near the breech, when the gun was fired. The case and primer pocket expansion was greater than those usually seen when a 70,000 p.s.i. high pressure test load is fired from the same type of gun, so the pressure was probably much higher than the 70,000 p.s.i. The rifle bore, full of water, would contain about 385 grs. of water, which is equivalent to adding 2.5 times the normal bullet mass that the powder pressure has to move. In spite of this additional resistance from the water, the rifle showed no bulging of the barrel or other damage While this limited test is interesting and gives you some idea what may happen it is not definitive. The results could be different if the same test were performed with a higher intensity cartridge or one of the magnum cartridges with large case capacity. [/QUOTE]
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Known Loads too hot now..why
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