Travis Haley and Ron Avery cover the Triggerstripe Drill. They work on trigger pull and move on to cadence firing with consistent trigger pull.
You can download the Practical Shooting Academy target they are using here. It’s designed to provide biofeedback. By shooting along the line either faster or further away, the shooter can gauge his trigger control.
Visit haleystrategic.com for more drills.
Excellent little tip/drill