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You figured right.

Those .3655 bullets in that .368 bore sure laid down the copper. It came out fairly easy with the right gunk but I didn't relish doing it.

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Don't beat me up for suggesting this. I cleaned with Iosso paste and Montana Extreme 50 cal copper cutter. Then I used Dyna Tek Bore Coat. It almost completely cured coppering up. Depends on your bore though. Mine is smooth. The decoppering agent in IMR 4166 works well in my Korean 308 M1 Garand and 8x57 Mausers. That may be helpful to the coppering problems.
I've got PRVI and Norma Vulkans loaded with IMR 4166 waiting to be chrono'd. Maybe I can sneak out next week. If I can get to 2100 with the 286gr and 2350 with the 232gr I'll be happy and quit.

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Dennis
Dress the bun, not the dog. And throw away that stupid knitted doggie sweater.

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