I hear ya Stan. I may have loosened up a dozen or more over the years meeself.

Poor mechanics, Loose machining, and crude metallurgy. Not grease.

In 40K rounds a brand new Browning O/U that was too tight to cock when new, will be too loose to safely shoot. And that's a modern gun in most respects, with an optimized design, modern machining, and modern alloys. It'll shake like a RRL.

Out there doing it best I can.