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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What kills barrel life on bigger magnums?
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<blockquote data-quote="Fiftydriver" data-source="post: 891796" data-attributes="member: 10"><p>One test I did many years ago that pretty much solidified my opinion on what keeps a barrel shooting well is when I tested some forward ignition systems in some of my wildcat chamberings.</p><p> </p><p> Not to get to detailed, forward ignition systems use a brass tube connected to the flashole in some manner that carries the primer flame to a position in the powder charge just under the base of the seated bullet. When the primer is ignited, the hot primer gases ignite the powder just behind the base of the bullet and the powder burns progressively from the front of the case to the rear.</p><p> </p><p> When you fire a case in a modern rifle, the ejected cases are hot at first but not DRAMATICALLY so and the first 1/3 of the barrel heats up quickly.</p><p> </p><p> With forward ignition being used, the ejected cases are NOTICABLY hotter then conventionally ignited cases but the bore simply does not heat up early as fast. Why, because the only thing going through the case neck is gas, no burning powder. As such, with nearly 100% of all the powder charge burning INSIDE the cartridge case, the case insulates the bore from the heat generated and the bore stays very cool.</p><p> </p><p> One test was with my 7mm Allen Magnum. In a sporter weight rifle, with conventional ignition, three rounds and the barrel was to hot to hold with a bare hand for more then a few seconds. With forward ignition, you could shoot 9 shots before the barrel temp reached the same temp as with conventional ignition systems.</p><p> </p><p> Barrel life also increased dramatically, 2-3 fold!!!</p><p> </p><p> You do have to change what powders you use for a given chambering because you are no longer PUSHING the weight of the powder charge and pushing ONLY the bullet weight. As such, you need to go to a slightly faster burning powder. In the end however, this system frees up pressure dramatically, again because your not pushing the powder charge throught the throat and in most tests, 100-150 fps performance increase was realized with same chamber pressure.</p><p> </p><p> With all these advantages however, its a PITA to fit each case with a flash tube and there is always a chance the flash tube could come loose and go down the bore. This is a liability issue I just could not live with so I stopped this testing until I figure out a better design that positively locks the flashtube in the case 100% of the time.</p><p> </p><p> It did however prove that bore temp was dramatically reduced and as such, barrel life exploded!!! Did not seem to matter what powder was used, ball, stick, it all showed similar results in the end. Also did not really matter what the case capacity was, in fact, the larger the case capacity was, the larger the difference in barrel life between conventional and forward ignition.</p><p> </p><p> Was really amazing results, just need to figure out the reliability of the system to bring it to the market.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 891796, member: 10"] One test I did many years ago that pretty much solidified my opinion on what keeps a barrel shooting well is when I tested some forward ignition systems in some of my wildcat chamberings. Not to get to detailed, forward ignition systems use a brass tube connected to the flashole in some manner that carries the primer flame to a position in the powder charge just under the base of the seated bullet. When the primer is ignited, the hot primer gases ignite the powder just behind the base of the bullet and the powder burns progressively from the front of the case to the rear. When you fire a case in a modern rifle, the ejected cases are hot at first but not DRAMATICALLY so and the first 1/3 of the barrel heats up quickly. With forward ignition being used, the ejected cases are NOTICABLY hotter then conventionally ignited cases but the bore simply does not heat up early as fast. Why, because the only thing going through the case neck is gas, no burning powder. As such, with nearly 100% of all the powder charge burning INSIDE the cartridge case, the case insulates the bore from the heat generated and the bore stays very cool. One test was with my 7mm Allen Magnum. In a sporter weight rifle, with conventional ignition, three rounds and the barrel was to hot to hold with a bare hand for more then a few seconds. With forward ignition, you could shoot 9 shots before the barrel temp reached the same temp as with conventional ignition systems. Barrel life also increased dramatically, 2-3 fold!!! You do have to change what powders you use for a given chambering because you are no longer PUSHING the weight of the powder charge and pushing ONLY the bullet weight. As such, you need to go to a slightly faster burning powder. In the end however, this system frees up pressure dramatically, again because your not pushing the powder charge throught the throat and in most tests, 100-150 fps performance increase was realized with same chamber pressure. With all these advantages however, its a PITA to fit each case with a flash tube and there is always a chance the flash tube could come loose and go down the bore. This is a liability issue I just could not live with so I stopped this testing until I figure out a better design that positively locks the flashtube in the case 100% of the time. It did however prove that bore temp was dramatically reduced and as such, barrel life exploded!!! Did not seem to matter what powder was used, ball, stick, it all showed similar results in the end. Also did not really matter what the case capacity was, in fact, the larger the case capacity was, the larger the difference in barrel life between conventional and forward ignition. Was really amazing results, just need to figure out the reliability of the system to bring it to the market. [/QUOTE]
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What kills barrel life on bigger magnums?
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