M1 Garand Barrel Issue

[Sawfish]

I have a Garand with a bore which has some mild pitting. After firing the bore looks much+++ dirtier than any other rifle I have ever used, including old Mosin Nagants with real rough bores. The fouling looks like whiskers. What's up with that?

Give it a good cleaning, then shoot it a bit and clean it again. Are you shooting lead?

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[big bear]

Give it a good cleaning, then shoot it a bit and clean it again. Are you shooting lead?

Nope, LC surplus from the 1960's.