io'm not sold on stainless barrels esp om muzzleloaders. i have had 2 stainless knights show signs of rust on the outside of th barrelm, and a brand new never firedwith rust on the inside of the bore. my triumph weathershield was with me for 3 days of rain,. freezing rain, sleet, snow without any signs of corrosion...on the outside. now leaving uncleaned after shooting bh209 for 3 weeks showed signs of rust on the inside of the bore, not the outside. i like the weathershield. i don't think that it could work in the bore since it's a bit of a textured finish and not smooth like a bore should be.
now weathershield on a stainless barrel would be the best of both worlds but could still rust up on you.