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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Remington 700 sps
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<blockquote data-quote="azsugarbear" data-source="post: 701894" data-attributes="member: 4809"><p>I just had the same thing happen to me with a custom barrel in 243. I went nuts eliminating possible causes such as COL, confirming same powder used, etc. In the end, I took it back to the smith - thinking I had done something to the action. He took one look down the barrel with his borescope and told me my barrel had a minimum of one layer of carbon over a layer of copper.</p><p> </p><p>I have a strict cleaning regimen using both BMG 50 for copper and GM carb cleaner for the carbon. My patches were clean at the end of my last cleaning, so I was absolutely convinced that my barrel was spotless - until he let me look down his borescope. There was the proof! Some barrels just don't clean as easily as others.</p><p> </p><p>The recommended cure was a little JB borepast. And I do mean just a little! Take some of their finest grit paste and put it on a clean patch. Go back and forth only four or five times over the first 6' of the barrel. Do not repeat. This is one of those cases where a little is good, but even more is bad. Clean out JB paste with oil, then one round of your normal cleaning regimen. </p><p> </p><p>Before you try any of this, clean your barrel thoroughly, then take it to a smith and have him look down the barrel. Most smiths will only charge $5-$10 for this service. You may be surprised by what you find.</p></blockquote><p></p>
[QUOTE="azsugarbear, post: 701894, member: 4809"] I just had the same thing happen to me with a custom barrel in 243. I went nuts eliminating possible causes such as COL, confirming same powder used, etc. In the end, I took it back to the smith - thinking I had done something to the action. He took one look down the barrel with his borescope and told me my barrel had a minimum of one layer of carbon over a layer of copper. I have a strict cleaning regimen using both BMG 50 for copper and GM carb cleaner for the carbon. My patches were clean at the end of my last cleaning, so I was absolutely convinced that my barrel was spotless - until he let me look down his borescope. There was the proof! Some barrels just don't clean as easily as others. The recommended cure was a little JB borepast. And I do mean just a little! Take some of their finest grit paste and put it on a clean patch. Go back and forth only four or five times over the first 6' of the barrel. Do not repeat. This is one of those cases where a little is good, but even more is bad. Clean out JB paste with oil, then one round of your normal cleaning regimen. Before you try any of this, clean your barrel thoroughly, then take it to a smith and have him look down the barrel. Most smiths will only charge $5-$10 for this service. You may be surprised by what you find. [/QUOTE]
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Remington 700 sps
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