Allen,

An important issue is sear engagement and the nature of the sear engagement.

You can have a 1.5 pound trigger not slam fire while a 3 pound trigger can slam fire.

As a side note, rifles like Wby, Rem 700 etc with spring loaded plunger ejectors can be set up where they will slam fire on an empty chamber but will not slam fire when a round is in the chamber. The spring loaded ejector acts as a buffer or cushion.

Another issue (which I know Echols looks after with his re pinning of the trigger) is that trigger pieces that are sloppy do not always have the same sear engagement from shot to shot and in particular the the trigger piece engages the sear at different angles.

Mike