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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A barrel that may be shot out?
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<blockquote data-quote="Mikecr" data-source="post: 2672371" data-attributes="member: 1521"><p>Over the years I've seen a lot of people associate barrel life with eroding and receding lands.</p><p>That happens while closing in on end of life, but it doesn't actually <em>cause</em> the passing of peak accuracy potential.</p><p>That is, unless you NEED a particular bullet-land relationship (like jammed), but often this is not actually needed (it's a choice).</p><p></p><p>The real end, is formation of an acute bore constriction.</p><p>It's carbon impinging into the bore surface, lifting it. The more heat, and the more carbon, the faster this happens.</p><p>Bullets swedge through it, and having no elasticity, they lose bore fitting further on.</p><p></p><p>You probably think I'm nuts, but this passes tests.</p><p>There are barrels out there still shooting great with even more than a couple inches of throat receding.</p><p>There a barrels that forever left the farm with relatively little throat erosion.</p><p>So apparently, it's not about throat erosion.</p><p></p><p>An interesting thing about use of moly, is that it demonstrates my notion here.</p><p>Moly does reduce severity of throat erosion, but it does not extend accurate barrel life, and if mismanaged can cut accurate barrel life in half.</p><p>How does it do that?</p><p>Moly cools the charge with an early phase change (latent heat). Later down the bore, it cools and plates out (another phase change).</p><p>It has a strong affinity for itself, so following bullets wipe moly layers on top of each other to form a ring. A constriction.</p><p>If allowed to build then at some point shots begin to throw from this.</p><p>The problem here is that moly (like carbon) is very tenacious, and now, the fix ends worse than failure... </p><p>End of accurate barrel life -regardless of throat erosion.</p><p></p><p><em>It just dawned on me: We need elastic bullets!</em></p></blockquote><p></p>
[QUOTE="Mikecr, post: 2672371, member: 1521"] Over the years I've seen a lot of people associate barrel life with eroding and receding lands. That happens while closing in on end of life, but it doesn't actually [I]cause[/I] the passing of peak accuracy potential. That is, unless you NEED a particular bullet-land relationship (like jammed), but often this is not actually needed (it's a choice). The real end, is formation of an acute bore constriction. It's carbon impinging into the bore surface, lifting it. The more heat, and the more carbon, the faster this happens. Bullets swedge through it, and having no elasticity, they lose bore fitting further on. You probably think I'm nuts, but this passes tests. There are barrels out there still shooting great with even more than a couple inches of throat receding. There a barrels that forever left the farm with relatively little throat erosion. So apparently, it's not about throat erosion. An interesting thing about use of moly, is that it demonstrates my notion here. Moly does reduce severity of throat erosion, but it does not extend accurate barrel life, and if mismanaged can cut accurate barrel life in half. How does it do that? Moly cools the charge with an early phase change (latent heat). Later down the bore, it cools and plates out (another phase change). It has a strong affinity for itself, so following bullets wipe moly layers on top of each other to form a ring. A constriction. If allowed to build then at some point shots begin to throw from this. The problem here is that moly (like carbon) is very tenacious, and now, the fix ends worse than failure... End of accurate barrel life -regardless of throat erosion. [I]It just dawned on me: We need elastic bullets![/I] [/QUOTE]
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A barrel that may be shot out?
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