I've got an Italian reproduction model '66 that fires 100% of time when firing quickly, but only 50% when truly squeezing the trigger as slowly as possible. I use Federal large pistol primers since they are supposed to be the softest, and make sure that I am seating against the bottom of the pocket. I've ruled out every other problem I can imagine, except for the possibility of the hammer momentarily hanging up on the half-cock notch. I've attached three photos showing the area and would appreciate any suggestions. I'm not a SASS competitor. I just like shooting old guns and would like to solve this problem so I can use this 45 Colt for hunting in close quarters.