the ammo was just purchased, and the gun is tight, you may have something ,4V50 Gary, I have my doubts as to if the pin protrudes far enough out of the breach face. the dimples on the primers of the shells that ignited were deeper than those of the shells that did not, ihave found that aquiring a replacement firing pin may be next to impossible. the pistol belonged to me great - grandfather ,who was a Deputy Sheriff in Monroe County Michigan in the Early 1900s.