Re: .22 dry fire
I have a different approach. I simply pull the uncocked trigger until it bottoms out. I don't really need to hear the striker snap to know when I've reached my goal. It also helps keep me from 'learning' the trigger, which can defeat the purpose of a good trigger manipulation technique.
I know myself, and I know that if I get into a habit of dry firing the rimfire, the time will come when I forget my snapcap, etc., will 'take the chance', and will tempt fate by dryfiring on an empty chamber. That's just dumb, when it comes to getting dumb and tempting fate, I'm not immune, and I'm probably not the only one on the forum who at might be vulnerable to this particular little temptation.
So, I have chosen my slightly different way of 'dryfiring'. Believe me, it works every bit as well as the other method, but there's no potential for peening the firing pin and/or chamber.
Greg