Is it just that some rifle barrels soak up copper more that others? I mean my barrel REALLY holds on to copper. I do my best and do it carefully to remove it but it stays in there. Remington 700 cdl .300 Win. With my last range trip not going well it is pretty frustrating. I might have around 200-250 rounds through it. I couldnt say if its still not broken in or not. Just strange. The rifle has always shot well up until my last range trip. Any ideas/suggestions?