I often find that switching to ammo with Remington primers takes care of it.
Right at the end of WW-II my Father picked up an 1896-vintage Remington Model 1894 AE-Grade that was practically new. The reason it had stayed that way for 50 years was that the firing pin protrusion was way too long. He made a template the thickness of the protrusion of the firing pins on his Model 1900 that worked fine, and filed the Model 1894's pins down to that length. Then with a very thin piece of metal to protect the breech face he filed the corners of the pins round. That AE-Grade was his go to gun for the next 42 years.
