Chuck

You happen to be a guru with rust in a bore? Picked up a JC Light Brazilianicon 7mm Mauser. Last 1-2" of the bore are a sewer pipe. Currently have it soaking in Kroil. Hope to be able to loosen the rust, and scrub it out with a bronze brush. Just looking to make a decent shooter out of it - 4" or so at 100 yds with irons and my old eyes...

Other option I was looking at was counter-boring the muzzle.

Your thoughts/advice/options, etc? Thanx