My shotguns tend to have 2 barrels, either horizontally or vertically arranged. They don’t give me trouble. The only repeater I have is a 3 1/2” Beretta automatic. I can shoot a round of sporting clays with it, 1 ounce loads, no problem. I only use it for waterfowl on big water, usually late season, cold weather. I keep it clean, no oil, just wipe down all the moving parts with Eezox, which leaves a slick, dry, almost waxy residue. Seems to work.