My cooper has never seen a copper coated bullet, nor will it as long as it is mine. It took 500 or so rounds to really settle in and for the next several thousand it seemed to get a bit better. After 4000 or so, it seems to have no change. I clean the rifle but never the barrel, I will never attempt to remove the lead as long as it shoots the same. Its now has about 10,000 through it and shoots better than I do.
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