Don’t have factory ammo in 6bra. 2 different firing pins now both same result. No pressure signs on the brass. The 205m primers that didn’t pierce cratered.
I have had the same issue, same actions, 3 of them, and BRA-Dasher size cases. I just replace the firing pin when all the brass is formed. I am sure you are learning, the more cratering and piercings you have, the worse it gets, the firing pin is getting damaged more. I may try a diamond file on mine.
Measuring firing pin extrusion is a good idea, may yield some insight.
The absolute worst for me was firing 500 pcs of peterson dasher brass for the first time, the brass was growing over .010" on the initial firing, and no, the chamber is not out of spec. In my case, CCI 450's cratered worse than 205M's. Out of 500, I bet i had 100 that were actually stuck to the firing pin on extraction. 30.2gr of H4895, 105 hybrid, peterson brass does have 2 less gr of case capacity, but I am not warm here either.
Give us your bump measurements, maybe your brass is growing in length more than designed. Upon firing, the primer has the tendency to leave the case long before the bullet gets too far in the barrel. I know you said you tried a 20 thou jam, try .050". Cratered primers are a pain but doable in FF, but pierced primers will shut you down quickly.
Speculation here, lol, but maybe your bent firing pins were the result of a pierced primer the round before, and that little spec of metal from the primer was clogging the firing pin hole, and upon firing the next rd, now that dot of metal in front of the pin made your firing pin way too long.
