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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
375 cal barrel twist and projectiles?
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<blockquote data-quote="noel carlson" data-source="post: 408517" data-attributes="member: 16138"><p>Kelly,</p><p> </p><p>"I will lay it out really simple here.....If a gun maker, or barrel maker were to only think of profit, why would they encourage a process that extends the life of a barrel??? "... It is even simpler than that. Selling a process that does not extend barrel life combines two sales in one. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p> </p><p>Your premise begs the question.</p><p> </p><p>Leaving the commercial incentive aside, look at the report I linked.</p><p> </p><p>Boeing was selling "Boeing Chrome" (TDC) against the established hard-chrome process. Nitriding came in as a distant third, which is really no mystery if you look at the periodic chart. Compare the melting points of chrome, and iron.</p><p> </p><p>Their test was done in a 3-5 round burst mode, followed by a barrel cool-down period, with ammunition specifically designed for fully automatic application. In comparison to the overbore cartridges, typically used for ELR, the forcing cone life in the nitrided test barrel was comparable to that of conventional barrels in small calibers. Other tests have produced the same results, as this is not a new question.</p><p> </p><p>This is why Fabrique National uses "thin dense chrome" ("Boeing" chrome) in the barrels of their re-released Model 70. This <em>does</em> increase throat life, whereas nitriding simply does not. As mentioned initially, a 60+ Rockwell hardness does have a function in bore treatments, but you are unlikely to ever shoot projectiles that need it.</p></blockquote><p></p>
[QUOTE="noel carlson, post: 408517, member: 16138"] Kelly, "I will lay it out really simple here.....If a gun maker, or barrel maker were to only think of profit, why would they encourage a process that extends the life of a barrel??? "... It is even simpler than that. Selling a process that does not extend barrel life combines two sales in one. :) Your premise begs the question. Leaving the commercial incentive aside, look at the report I linked. Boeing was selling "Boeing Chrome" (TDC) against the established hard-chrome process. Nitriding came in as a distant third, which is really no mystery if you look at the periodic chart. Compare the melting points of chrome, and iron. Their test was done in a 3-5 round burst mode, followed by a barrel cool-down period, with ammunition specifically designed for fully automatic application. In comparison to the overbore cartridges, typically used for ELR, the forcing cone life in the nitrided test barrel was comparable to that of conventional barrels in small calibers. Other tests have produced the same results, as this is not a new question. This is why Fabrique National uses "thin dense chrome" ("Boeing" chrome) in the barrels of their re-released Model 70. This [I]does[/I] increase throat life, whereas nitriding simply does not. As mentioned initially, a 60+ Rockwell hardness does have a function in bore treatments, but you are unlikely to ever shoot projectiles that need it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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375 cal barrel twist and projectiles?
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