Old sniper trick : use the tall finger on the trigger.

My grandfather was a horse soldier, and among the secrets he imparted to his son, my father, was which finger to use on the trigger. Our primate brain knows where the index finger is pointed, even in the dark. This makes it perfect for target acquisition, but not dispatch. Perhaps that's why it has so many veins and nerves. The tall finger has far fewer. Some say it has no pulse, but they're wrong. It's faint but there. It's far fainter than the pulse in the index finger. This...

Old sniper trick : use the tall finger on the trigger.