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<blockquote data-quote="Hugnot" data-source="post: 2576933" data-attributes="member: 115658"><p>I sometimes use JB on a oil (surfacant type) soaked patch. Most of my barrels are the 5R type. I am aware of advisories not to scrub barrels out with brushes & JB, so I don't do it. I don't understand why that method would damage barrels as the JB is touted as being a non imbedding abrasive (garnet), approved for bore cleaning with patches. J-B on brush bristles, bronze or nylon are much softer than barrel steel and J-B used with brushes has a reputation for barrel damage. Montana bore polish is aluminum oxide ( hard stuff used in sandpaper).</p><p></p><p>looking at:</p><p></p><p>[URL unfurl="true"]https://www.reade.com/reade-resources/reference-educational/reade-reference-chart-particle-property-briefings/32-mohs-hardness-of-abrasives[/URL]</p><p></p><p>Both garnet & aluminum oxide are hard abrasives, like used in sandpaper. MOHS being about 7. Touted as being OK with patches but nasty with brushes? Would the hard bronze or nylon result in abrasive particles to be embedded & fixed in bristles causing the bristles to dig into barrel steel or would a cloth patch allow the abrasive particles to slide over barrel steel but remove softer fouling?</p><p></p><p>Bon Ami as a bore cleaner? - contains feldspar (mineral) & calcium carbonate (limestone) touted as - "hasn't scratched yet" with pic of small chicken. Feldspar has a MOHS of 6. I used Bon Ami some time ago, with patches, on a super neglected .243 but was told it would destroy my barrel but the reason was unclear.</p><p></p><p>What about barrel lapping?</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2576933, member: 115658"] I sometimes use JB on a oil (surfacant type) soaked patch. Most of my barrels are the 5R type. I am aware of advisories not to scrub barrels out with brushes & JB, so I don't do it. I don't understand why that method would damage barrels as the JB is touted as being a non imbedding abrasive (garnet), approved for bore cleaning with patches. J-B on brush bristles, bronze or nylon are much softer than barrel steel and J-B used with brushes has a reputation for barrel damage. Montana bore polish is aluminum oxide ( hard stuff used in sandpaper). looking at: [URL unfurl="true"]https://www.reade.com/reade-resources/reference-educational/reade-reference-chart-particle-property-briefings/32-mohs-hardness-of-abrasives[/URL] Both garnet & aluminum oxide are hard abrasives, like used in sandpaper. MOHS being about 7. Touted as being OK with patches but nasty with brushes? Would the hard bronze or nylon result in abrasive particles to be embedded & fixed in bristles causing the bristles to dig into barrel steel or would a cloth patch allow the abrasive particles to slide over barrel steel but remove softer fouling? Bon Ami as a bore cleaner? - contains feldspar (mineral) & calcium carbonate (limestone) touted as - "hasn't scratched yet" with pic of small chicken. Feldspar has a MOHS of 6. I used Bon Ami some time ago, with patches, on a super neglected .243 but was told it would destroy my barrel but the reason was unclear. What about barrel lapping? [/QUOTE]
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