90% of shooters we see SLAP the trigger, it's either a straight-up slap or lighter tap,
The reasons are
1. The trigger is too light the shooter is afraid of it
2. Speed: they are moving faster than they can manage
3. Poor Fundamentals and understanding, they want to influence the rifle less so they tap it vs following through.
I call "follow-through" the Forgotten Fundamental because we use lighter calibers with heavier rifles so you can get away with a lot. By adjusting the trigger down as far as possible they are hoping to minimize the shooter influence on the shot, fast caliber, light bullet, less recoil everything is over quickly, hopefully before the shooter moves.
The rifle is a musical instrument, we talk barrel harmonics all the time when it comes to shooting, reloading, etc, don't let stuff touch the barrel. But the barrel is attached to a metal action, and trigger connected with metal screws, when you move and tap or slap the trigger you are changing the note you are playing. Consistency is king.
Follow Through is about consistency, I use the golf analogy all the time because there is a video of Golf Great Phil Mickelson shooting a 6.5CM and tapping / slapping the trigger. If I want to golf school and as soon as the club hit the ball I disengaged or let go of the club everyone would freak out... I can then argue that once the ball is touched by the club it is moving away and follow through in Golf is Meaningless because the club is no longer influencing the ball. Think about that a second... In shooting the bullet remains under influence for a much longer period of TIME.
remember we key off the sound, and releasing of the firing pin is turning the MACHINE ON, not off... we are starting the process and not ending it. We can look at lock time for firing pins, but there are is also personal lock times and then the dwell time in the barrel. We have to recognize that time and understand because we key off the firing pin drop and the primer being hit we can beat the bullet no problem. A bolt action has about a 4ms lock time, an AR about 8ms to 12ms, which is why people can't shoot them well, they are moving during the firing process. Once you understand this, your shooting will be on a different level.
to get 20 MOA At 100 yards we use an angled or canted base, those 20MOA bases are .11" different from front to back. Movement no thicker than a human hair can have inches of repucussions are 100 yards and beyond.
Follow Through the Forgotten Fundamental