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<blockquote data-quote="Mikecr" data-source="post: 2700850" data-attributes="member: 1521"><p>I'm not talking about a buildup, although any buildup(carbon, moly, copper) or late rough patch can kill accurate barrel life -if it's reached a point where fixing it would kill the barrel anyway.</p><p></p><p>I'm talking about carbon surface/subsurface fusing with metal, leading to a very small constriction some length down barrels.</p><p>This, causing extruding of passing bullets, then looser in bores.</p><p>I base this notion on testing performed by someone a long time ago. They used a 6PPC and an air gauge to see it.</p><p>While I haven't validated it myself (and pre-internet, no link to it), I have seen that it passes all tests otherwise. All of us can see it, and nobody has escaped it with standard barrel steel.</p><p></p><p>It's important to remind that this is not barrel life that I'm talking about, but accurate barrel life (big difference). </p><p>You can go right past accurate barrel life, if you never reached a <u>peak</u> accuracy to begin with, and never know it. </p><p>This is a condition behind so many wild claims of barrel life.</p><p>For instance, if your barrel is capable of 1/4moa, but your best has been 3/8 to 1/2moa and you're happy with that, you will not know when passing 1/4moa capable until passing your 1/2moa capability. That could be a long ways beyond accurate barrel life.</p><p>If content with 1moa, then I imagine some guns, like a once competitive 6PPC, could shoot at least that forever!</p><p></p><p>People adjust to extend accurate barrel life, but it never lasts, and the worsening accelerates.</p><p>We're not adjusting the root cause.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2700850, member: 1521"] I'm not talking about a buildup, although any buildup(carbon, moly, copper) or late rough patch can kill accurate barrel life -if it's reached a point where fixing it would kill the barrel anyway. I'm talking about carbon surface/subsurface fusing with metal, leading to a very small constriction some length down barrels. This, causing extruding of passing bullets, then looser in bores. I base this notion on testing performed by someone a long time ago. They used a 6PPC and an air gauge to see it. While I haven't validated it myself (and pre-internet, no link to it), I have seen that it passes all tests otherwise. All of us can see it, and nobody has escaped it with standard barrel steel. It's important to remind that this is not barrel life that I'm talking about, but accurate barrel life (big difference). You can go right past accurate barrel life, if you never reached a [U]peak[/U] accuracy to begin with, and never know it. This is a condition behind so many wild claims of barrel life. For instance, if your barrel is capable of 1/4moa, but your best has been 3/8 to 1/2moa and you're happy with that, you will not know when passing 1/4moa capable until passing your 1/2moa capability. That could be a long ways beyond accurate barrel life. If content with 1moa, then I imagine some guns, like a once competitive 6PPC, could shoot at least that forever! People adjust to extend accurate barrel life, but it never lasts, and the worsening accelerates. We're not adjusting the root cause. [/QUOTE]
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