I agree with what Brutal said about the moly. That could have started your problem. I also agree with Skeeter about the probable condition of the bore. If it was mine I would JB the he** out of it. I think you need to make sure all the moly is out of it, and this should also polish the bore. Be extremely careful at the muzzle, do not take off too much material out there. Ask Roskoe the best procedure for this, I think he is pretty smart about barrels. After JB'ing, I would treat the barrel as if I was breaking in a new one.

I normally use Sweet's, and clean about every 20-30 shots. After cleaning I shoot two shells off handed off the porch at my gong. And then she is ready to go. You guys may think I am nuts, but unless my rifle is going into long term storage, I do not put any oil in my barrel. Tom.