Wonder about taking a page from the muzzleloaders and clean and season that section with bore butter or some such.
Years ago, I had a problem with after-rust in the bores of my black powder flintlocks. No matter how carefully I cleaned with boiling water, detergents, solvents, etc. followed by thorough drying and oiling, I would get red rust on a patch pushed through the bores.
I switched to Thompson Center Natural Lube 1000 for a patch and bullet lube and to protect the bore after cleaning (with hot water only) and the problem disappeared like magic. I thought that if this product protected black powder guns so well, it might be worth a try on my shotguns. I did, and it worked... even on those long rainy day hunts where I came home dog tired and put off cleaning my gun until the next day.
Geo, if your Daly has mirror bores when clean, I'd avoid the Naval Jelly. The phosphoric acid will clean any rust but it will also etch the metal.
