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<blockquote data-quote="Blitzfike" data-source="post: 1472974" data-attributes="member: 807"><p>Dennis hit the nail on the head as far as rifle powders.. Some rifles are particularly sensitive to powder selection, such as the M1 Garand. Since the gas port is close to the end of the barrel on it, bullet/powder selection is critical with it, to keep the pressure spike within the operating range of the action. Faster burning powders with bullet weights of 168 grains or less or optimal in it. Slower burning powders or heavier bullets can cause the operating rod on a garand to destruct. The key in weapons that aren't sensitive to the pressure curve for gas operation is to choose a powder bullet combination that just finishes burning completely before the bullet leaves the barrel without creating pressures greater than the weapon and bullet can stand. I shoot .204 ruger and .223 Rem out of bolt rifles and have to be careful that I don't drive the bullet so fast that it disintegretes in flight. With a 32 grain bullet out of the 204, I can easily exceed 4000 fps if not careful. Another thing to watch is barrel erosion from the propellant gasses with super high pressure/velocity loads. Many of the early experiments with the .17 caliber chamberings had very short barrel life due to erosion. I've played with using pistol powders in cast bullet rifle loads and while they are cheap to shoot, they leave a lot to be desired in my experience. I prefer to stick with standard rifle propellants with cast bullets and just reduce the charge to keep the bullet velocity at 1200fps or below. Very little leading with gas checked bullets and very accurate. Lots of the things I have tried were things that the so called experts in the magazines claimed couldn't be done. Don't be afraid to try something different, just be sure to research your project to keep it safe. Do a lot of reading and trying established loads before you venture out into the unknown... Blitzfike</p></blockquote><p></p>
[QUOTE="Blitzfike, post: 1472974, member: 807"] Dennis hit the nail on the head as far as rifle powders.. Some rifles are particularly sensitive to powder selection, such as the M1 Garand. Since the gas port is close to the end of the barrel on it, bullet/powder selection is critical with it, to keep the pressure spike within the operating range of the action. Faster burning powders with bullet weights of 168 grains or less or optimal in it. Slower burning powders or heavier bullets can cause the operating rod on a garand to destruct. The key in weapons that aren't sensitive to the pressure curve for gas operation is to choose a powder bullet combination that just finishes burning completely before the bullet leaves the barrel without creating pressures greater than the weapon and bullet can stand. I shoot .204 ruger and .223 Rem out of bolt rifles and have to be careful that I don't drive the bullet so fast that it disintegretes in flight. With a 32 grain bullet out of the 204, I can easily exceed 4000 fps if not careful. Another thing to watch is barrel erosion from the propellant gasses with super high pressure/velocity loads. Many of the early experiments with the .17 caliber chamberings had very short barrel life due to erosion. I've played with using pistol powders in cast bullet rifle loads and while they are cheap to shoot, they leave a lot to be desired in my experience. I prefer to stick with standard rifle propellants with cast bullets and just reduce the charge to keep the bullet velocity at 1200fps or below. Very little leading with gas checked bullets and very accurate. Lots of the things I have tried were things that the so called experts in the magazines claimed couldn't be done. Don't be afraid to try something different, just be sure to research your project to keep it safe. Do a lot of reading and trying established loads before you venture out into the unknown... Blitzfike [/QUOTE]
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