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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel erosion?
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<blockquote data-quote="Mikecr" data-source="post: 1663776" data-attributes="member: 1521"><p>The only use for my borescope w/resp to accuracy is seeing that I got all the copper out.</p><p>Most barrels do not wear out, as they're replaced far in advance of something like that.</p><p>The lands are heated, surface opened, to a point where each shot can knock away tiny bits (erosion). Some would see this as wearing (I don't). But this only hurts accuracy if your load is reliant on chasing lands, and you're not keeping up with tested land relationship, along with powder & tension adjustments to do that..</p><p></p><p>What kills accuracy is carbon constrictions. This follows accumulations as the metal surface opens to let carbon work it's way in. The surface opens most where it's hottest.</p><p>It can be slowed via regular & rational application of an abrasive (like JB non-embedding bore compound) during cleanings. At some point this will no longer work and instead accelerate bore damage (it begins to break more bits off). Stubborn folks may decide then to set a barrel back for a few hundred more accurate shots.. I say you should have had a new barrel in waiting by then.</p><p></p><p>Another reason I suggest that our tossed barrels didn't wear out, is because we could if we chose to, set back a barrel far enough to practically start over, because 5-10" down the bore the surface was never opening enough to let carbon in. That is, unless you allowed the barrel to get hot enough for that, and rarely cleaned the bore*.</p><p>That said, it is entirely possible to wipe out a barrel in one shooting session (I've seen this).</p><p></p><p>Anyway, you don't normally see the carbon that is killing accuracy. But you can often feel it while pushing tight patches through the bore.</p><p>*One example where you can see it is with use of moly. This condenses further down the bore, and is wiped in layers to form a ring that is both visible and felt with patches. By the time you get there with it, the efforts to fix that bore will also destroy it. Game over.</p><p></p><p>There is another method of managing all this: Tubb's TMS</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1663776, member: 1521"] The only use for my borescope w/resp to accuracy is seeing that I got all the copper out. Most barrels do not wear out, as they're replaced far in advance of something like that. The lands are heated, surface opened, to a point where each shot can knock away tiny bits (erosion). Some would see this as wearing (I don't). But this only hurts accuracy if your load is reliant on chasing lands, and you're not keeping up with tested land relationship, along with powder & tension adjustments to do that.. What kills accuracy is carbon constrictions. This follows accumulations as the metal surface opens to let carbon work it's way in. The surface opens most where it's hottest. It can be slowed via regular & rational application of an abrasive (like JB non-embedding bore compound) during cleanings. At some point this will no longer work and instead accelerate bore damage (it begins to break more bits off). Stubborn folks may decide then to set a barrel back for a few hundred more accurate shots.. I say you should have had a new barrel in waiting by then. Another reason I suggest that our tossed barrels didn't wear out, is because we could if we chose to, set back a barrel far enough to practically start over, because 5-10" down the bore the surface was never opening enough to let carbon in. That is, unless you allowed the barrel to get hot enough for that, and rarely cleaned the bore*. That said, it is entirely possible to wipe out a barrel in one shooting session (I've seen this). Anyway, you don't normally see the carbon that is killing accuracy. But you can often feel it while pushing tight patches through the bore. *One example where you can see it is with use of moly. This condenses further down the bore, and is wiped in layers to form a ring that is both visible and felt with patches. By the time you get there with it, the efforts to fix that bore will also destroy it. Game over. There is another method of managing all this: Tubb's TMS [/QUOTE]
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Barrel erosion?
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