[tango3065]

I have a new ruger stainless 270 shot only around 20 times and always clean good, when I shine a light down the barrell it looks likes rust but a bronze brush wont remove it, is it possible this is copper that comes of the bulletts, I think it is but would like someone who knows to help me be sure.

[J Calhoun]

Copper will leave orange looking streaks in a barrel. Try a copper remover and brush it a few times. Blue and/or green stains on a patch are copper. Orange stains will be rust.

[tango3065]

They are a blackish blue color on a patch. So is this a common thing with high power rifles and also what are the effects if i dont remove this.

[Art Eatman]

Overall, just keep shooting and cleaning. Continue with the copper remover.

Could be the barrel didn't start out as smooth as it should have. Shooting will burnish the bore. Over time, the copper will quit building up as much as at present, I'm guessing.

How many shots do you fire at any one outing? And, is hunting your primary purpose for that rifle? If you're using factory ammo and getting three-shot groups of one MOA or better, you're okay for accuracy.

Right now, I'd guess that group size will increase after you shoot enough to get a notable buildup of copper, which is why the recommendation to keep using that cleaner...

Art

[uglymofo]

For cleaning copper, if you're gonna use Sweet's 7.62, TIME yourself, and adhere to the directions. I dunno about any other brand but the barrel's exposure to Sweet's is critical; too long, and you'll permanently etch the bore. The only product I know of for sure that I've used that doesn't require timing the soaking time is Spooge http://www.answerrifles.com/spooge.htm . It's very expensive ($29/kit) but you can forget about the rifle overnight:rolleyes: :) and still be fine. That extra $22 is mighty cheap insurance.

[Larry Ashcraft]

I would suggest finding a gunsmith with a bore scope (really neat tools, but they cost $600-800). That way you can see what you are dealing with.