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Old April 29, 2013, 08:51 AM   #4
Malamute
Senior Member
 
Join Date: June 6, 2004
Location: Rocky Mts
Posts: 820
What you're seeing may be copper fouling, not rust. Copper looks orange-ish in a bore. Try a good copper removal cleaning, maybe using a special copper solvent, and follow their directions.
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