There is no hinge pin wearing, when you shooting, hinge pin wearing occures when you open and close your guns. Also its myth about extreme pressures on hinge pin when shooting, it will be enough to draw diagram with all hooks, bites and bolt to figure out all impuls and to understand it and most important its time while this forces will effect, its really Extremely short time.
I could call several old gun experts that wrote about using light oil with wiping it for hinge pins, its not my idea, it was long time practice. And most important is to renew lubes on hinge pins after every hunting or every shooting.

Geno.