Off beat question from the normal precision rifle topics. I inherited an Austin Halleck 50 caliber muzzle loader (out of business) and the inside of the barrel possesses a significant amount of rust - visible when viewing from the muzzle end. It's an inline ML with a very nice trigger and beautiful stock with great bluing however the barrel looks really BAD. Any ideas on how to salvage the barrel and remove the rust? Ideas and suggestions greatly appreciated! Thanks!