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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
The Solid Bullet Debate
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<blockquote data-quote="noel carlson" data-source="post: 289844" data-attributes="member: 16138"><p>O.K. ...</p><p> </p><p>I knew the "debate" characterization of this thread was something of a misnomer, so I will just monologue until someone has a question/challenge.</p><p> </p><p>In the early development of the cobalt family alloys, it was discovered that a welding contact, made from copper, would induce localized micro-cracking if the temperature came anywhere close to solution temperature, and this holds true for <em>all</em> cobalt alloys. In a bore, this is obviously a bad thing. </p><p> </p><p>From experimentation, I can tell you that nothing beats copper as a projectile bearing surface. How was this incompatability issue to be resolved? A friend, from the polymer industry, drew my attention to a TiO2/SiO2 gel used as a lubricant/protectant in hyper-velocity APSD munitions. When loaded into a cartridge, it deposits a continuously renewed ceramic layer in the throat. Presto! No more compatability problem... and then there were the other benefits. Fouling is virtually non-existant, and projectile exit velocities were consistantly single-digit in variation.</p><p> </p><p>Once again, some of you might be saying to yourselves "My barrel does not really foul to any great extent now, and my MVs are pretty consistent also.". </p><p> </p><p>My answer is that you are still all throwing away that barrel following a few thousand rounds due to heat-erosion. This will make even a 416 barrel live for alot longer (I do not actually know how much longer.). The trick is to utilize a shell casing that is designed to disperse the gel. As it happens, this shell casing has approximately the same life as the barrel itself... that is a <em>single </em>shell casing. Is anyone tired of buying, and reworking, quality brass?</p><p> </p><p>I will go to rifling geometry unless anyone has a question at this point.</p></blockquote><p></p>
[QUOTE="noel carlson, post: 289844, member: 16138"] O.K. ... I knew the "debate" characterization of this thread was something of a misnomer, so I will just monologue until someone has a question/challenge. In the early development of the cobalt family alloys, it was discovered that a welding contact, made from copper, would induce localized micro-cracking if the temperature came anywhere close to solution temperature, and this holds true for [I]all[/I] cobalt alloys. In a bore, this is obviously a bad thing. From experimentation, I can tell you that nothing beats copper as a projectile bearing surface. How was this incompatability issue to be resolved? A friend, from the polymer industry, drew my attention to a TiO2/SiO2 gel used as a lubricant/protectant in hyper-velocity APSD munitions. When loaded into a cartridge, it deposits a continuously renewed ceramic layer in the throat. Presto! No more compatability problem... and then there were the other benefits. Fouling is virtually non-existant, and projectile exit velocities were consistantly single-digit in variation. Once again, some of you might be saying to yourselves "My barrel does not really foul to any great extent now, and my MVs are pretty consistent also.". My answer is that you are still all throwing away that barrel following a few thousand rounds due to heat-erosion. This will make even a 416 barrel live for alot longer (I do not actually know how much longer.). The trick is to utilize a shell casing that is designed to disperse the gel. As it happens, this shell casing has approximately the same life as the barrel itself... that is a [I]single [/I]shell casing. Is anyone tired of buying, and reworking, quality brass? I will go to rifling geometry unless anyone has a question at this point. [/QUOTE]
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The Solid Bullet Debate
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