Ball and Dummy Drill
A diagnostic drill that mixes live and inert rounds at random so a flinch reveals itself on the dummy, exposing trigger faults.
The ball and dummy drill randomly mixes live cartridges with inert dummy-round cases so the shooter never knows whether the next press will fire. When the rifle does not go off, any flinch, jerk, or anticipation of recoil shows up clearly as the muzzle dips or the reticle jumps, making it one of the most honest diagnostics for trigger-control.
A partner can load the magazine to keep the sequence truly unknown, or the shooter can shuffle rounds blind. The drill reinforces the same smooth, surprise-break press that dry-fire practice teaches, and it depends on solid follow-through because the goal is to keep the sight picture undisturbed whether the round fires or not.