Trigger Pull
The act of operating the trigger, the shooter's technique rather than the rifle's setting. Done well, the break barely disturbs the sight picture.
A clean trigger pull is straight back, slow and smooth at the front, fast through the break. Think of it as a steady press rather than a sudden yank on the shoe. The wall (in a two-stage) tells you where you are; from there, ride the wall down to the break without disturbing the reticle.
Trigger pull is the most coachable mistake in precision shooting. Dry fire 200 reps in a session and you’ll see your reticle stop jumping at break, and your groups will tighten the next time you shoot live.