Pierced primers

[Roosterpoop]

In doing a quick search I see that it is not uncommon for the open top Colt clones to pierce primers.  I have a Cimmaron 1872 conversion.  The first time I shot it I did not realize it was piercing all the primers.  I only fired a few rounds.  Then I bought some reloaded ammo and was really going to give the gun a try.  I love the way it points, easy to hit with.  Anyway I started filing down the firing pin and got it to where it does not pierce the primers but now it will only fire about 4 out of five rounds.  I have not studied it enough yet to know if it is the same chamber each time or if it is the same brand of brass.  I have ordered a couple new firing pins and would like to get one that is reliable and not dangerous.  Anyone have experience with this?  I have alway been told that it is not good to be piercing primers. 

[Roosterman]

Switch primers and lighten up your mainspring.

[Capt. Augustus]

Before I got my OT's I saw an entry about using Winchester primers to avoid the piercing, so I tried it.  They get a mighty deep dent, but they stay whole.

[Coffinmaker]

Well, now you get to start over with a new firing pin.  First replace the firing pin, then reduce the poser of the main spring, then attach the firing pin a LITTLE at a time.  Contact VTI gunparts for a firing pin and a reduced power main spring.

Coffinmaker

[Roosterpoop]

Thanks for the advice pards.  I can't do anything about the primers on this reloaded ammo but I will lighten the spring and go a little slower with the filing of the new firing pin.