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Old May 1, 2013, 05:02 PM   #16
JD0x0
Senior Member
 
Join Date: January 30, 2013
Posts: 856
It's most likely copper fouling. Use a product that is meant to deal with copper fouling. IF it is rust, which I doubt it is, just shoot it out and then make sure to clean and oil the bore to prevent it from happening again.
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