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P5 Guy · January 9, 2017, 01:26 PM

Yep, that is copper fouling not rust.
Butch's Bore Shine is a more aggressive copper remover than the Hoppes Bench Rest. But a bit of fouling is at times desirable. A couple of fouling shots and most bench rest guys then go for record.

January 9, 2017, 01:26 PM	#24
P5 Guy Senior Member Join Date: December 1, 2005 Location: Tampa Bay Posts: 1,804	Yep, that is copper fouling not rust. Butch's Bore Shine is a more aggressive copper remover than the Hoppes Bench Rest. But a bit of fouling is at times desirable. A couple of fouling shots and most bench rest guys then go for record.