You'll NEVER catch me doing this!!!
If some of you have done it & not had problems, more power to ya.
But, respectfully, I think you're insane to try it.
I'll sit on stand, or still-hunt deer with a shell chambered...but I keep my safety ON, & my finger out of the trigger guard.
I have never had a legitamate shot opportunity where I didn't have time to...shoulder my gun; move the safety switch to FIRE position; & then put my finger on the trigger, before actually firing.
Heck, I do all that naturally as I'm taking aim.