This diagram I swiped from an early Hammerli cheat sheet. It shows how the firing pin tip should be ground to a point, thereby reducing the surface area of the striking area (Toz pins are normally a wedge).
I must follow this up with a warning that it's not an easy fix. It is critical that you end up with the point hitting directly in line with the case wall; not out on the rim, and not inside the rim. It took me a half a day to get it right, taking a little off at a time, reassembling and checking the strike point many times. If you get it wrong, the firing pin is junk.
It's also important not to create lots of heat, you can easily temper the pin if it gets too hot, meaning you'd end up with a soft tip. I did mine by hand with a fine file. It was slower than using a grinder but safer.[/img]