Thread: Cleaning Heavy Copper

Soak it in kerosine. Repeat as required. No need to reinvent the wheel.

Dont use Sweets if it's a stainless barrel tho.

Originally Posted by Stag

..an old fella showed me to use a funnel and tube to pour a jug of boiling water down the barrel before you start cleaning ..

Man, that's an ancient technique. Was relevant for .303s that had corrosive potassium chlorate primers which left potassium chloride (salt) in the barrel. Flushing with boiling water helped prior to the main cleaning.

Getting back to the orig query, copper fouling that stubborn needs mechanical agitation with say KG12 and left to soak for several hours. If after say five cycles of this the borescope is still showing fouling, it's time to get out Autosol or JBs. Autosol for sure is NOT significantly abrasive on the rifling. Actually, in this case, it might help make the bore less prone to copper buildup.