as far as offhand shooting goes, back when I was shooting competitively back in the 80s my friend and mentor told me this. "You will never be able to hold your muzzle dead still. Just relax and let it move. Consistent practice will train your muscles to get the muzzle moving in smaller and smaller circles. And you just squeeze the trigger with steady pressure." Looking through a 20X Unertel scope as its circling the target I've found that it's somewhat of a mystery how that bullet could find the X ring on a regular basis!