An excellent way to see exactly how much your rifle's bore axis moves around as you fire it is to tape a laser pointer onto its barrel. Lock it turned on somehow, then just hold the rifle across your lap and dry fire it while watching the spot on a wall some distance away.
You'll immediately see how it wiggles around while you apply pressure on the trigger, then, as the firing pin falls, it does different things. Somewhere between jumping all over the place from where it wiggled before you fired it to somewhere in the same area it wiggles at while pressure on the trigger's applied.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master