Yes, I dry fire with dummy rounds chambered but not in the mag as part of my safety protocol for dry fire practice. Dummy rounds and live rounds with a full mag do not eliminate the exaggerated, in comparison to the other guns, jump.
What my curiosity was in regards to overtravel is that if you are moving the gun in the trigger press due to overtravel you are moving it before the sear release, a bad trigger finger is bad the whole pull, at least that’s the way I assess it.
I just found out how to access the thread which lior referenced, headed there now.