Where the finger goes
For a crisp precision trigger, the trigger should sit between the tip and the first joint (the pad of the fingertip), roughly the center of the pad. You want enough finger to press straight to the rear without dragging the rifle.
The critical requirement: the trigger finger must move STRAIGHT to the rear and contact ONLY the trigger. If your finger drags on the stock or you use too much finger (past the first joint), you'll push the muzzle to one side as it breaks — classic left/low or right groups.
Isolation
Only the trigger finger moves. The rest of the hand stays relaxed and still. A common error is 'milking' — the whole hand tightening as the finger presses, which torques the rifle. Grip pressure should be set before you start the press and stay constant.
The surprise break
Take up any slack/take-up until you feel the 'wall' (the point of resistance before the sear releases). Then apply smooth, steadily increasing pressure straight back. The shot should break as a surprise — you should not be able to predict the exact instant.
Why a surprise? If you know the exact moment of the break, you will anticipate the recoil and flinch — tensing, pushing the muzzle down — milliseconds before the bullet leaves. That anticipation is the #1 cause of misses in otherwise solid shooters. A surprise break can't be flinched.
Through the break, keep pressing — don't slap or release the instant it fires. The press and follow-through are one continuous motion.
Diagnosing trigger errors
Shots low-left (for a right-handed shooter) almost always mean anticipation/flinch or too much finger. Shots stringing horizontally often mean the finger is dragging the stock.
Ball-and-dummy drill (covered in Drills): have a partner load a dummy round randomly. On the dummy, you'll see the muzzle dip if you're flinching — instant, honest feedback.