I teach a CCW class and usually have one or more students that jerk the trigger, just the way I tend to jerk the release on my bow when I'm having a bad day. I often give them a revolver with a laser sight on it and have them just keep stroking the trigger double action until they can do it without moving the red dot on the target.
I kind of do the same thing with my bow, except there is no target and, of course, no sight. I move up close to the bag and just start shooting blind bale concentrating on getting the same kind of release I get with a "string bow", where my hand just relaxes and moves straight back when the string slips off my fingers. If that's the only thing I'm REALLY concentrating on, it gets pretty clean. Then I work on maintaining good back tension without screwing up my release.
Check out "moebow" videos on YouTube. He does a beautiful job of explaining and demonstrating proper release. Sure helped me with my flinch/jerky release.