The barrel on my first build was in storage for 30yrs. It has a natural Patina on it that looks like it may extend into the bore. The was a post last april on a similar subject and was wondering if this would apply? This is a Quote from Don Getz
I've discussed using this many times before. Use some scotchbrite, works better than steel wool, and is easier to use.
Cut a piece of scotchbrite about 2" x 3", tape the 3" edge to a small ramrod, steel, brass, whatever you use for cleaning the gun. Wrap the scotchbrite tightly around the rod, then trim with a scissors until it will go tightly into the bore, then
run it up and down the barrel about 100 times. It will take that sharp edge off the lands and will polish the bore, but will
not remove steel. I've found that it is much easier to use this than steel wool, and won't leave any of those fine steel
particles in the bore................Don
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Rich