Bullets scratch barrel?

[mr_p7m8]

After shooting some +p rounds and some fmj rounds i found that my gun's barrel isn't completely shiney after cleaning it. Instead there seems to be some scratch marks along the rifling as if caused by the bullet.

Is this possible? could this be caused by +p rounds or fmj rounds on polygon rifling?

thanks

 

[George Hill]

Poly rifling is ment for jacketed rounds...

Anytime you rub metal against metal you will get some form wear... call it errosion - its natural. You can expect a barrel to last only an X number of rounds. X = varies barrel to barrel and varies with the type of use it gets.

But you say you now have a scratch? not knowing the extent - it may or may not effect your accuracy. The scratch could be just cosmetic. The cause for it could be a couple things... One - a foregin object in the bore. Two miss use of a cleaning rod... or a really wacked out bullet flaw may have had something in its jacketing that did it - if the scratch is consistant with the rifling.
I think you had some grit in the bore before you fired... just a guess.
You gun's "Hygene" is almost always a factor.

 

[Dave Finfrock]

If what you're seeing is streak-like marks in a polygon barrel, they're most likely copper deposits. When you get the carbon out of an HK barrel, you'll usually see these. Start scrubbing, you'll eventually get them out.