dry-fire and save some ammo!
Some highly proficient shooters in the Bullseye world do really high ratios of dry-fire to live ammo, like 50-1 or 100-1.
You can do things like put a penny on the barrel and see if your trigger squeeze jostles it, or go 3-5" away from a dot on the wall and see if your sights move.
Others can provide better drills and descriptions of drills.
"Jeez, man, what's another word for 'stupid?'"
"Tactical." -Tom Servo
Marlin 795, 795ss, 39A Mountie, CZ-455 American, CZ-452 Scout, CZ-75 Kadet, AOM160 M1 Carbine, USGI M1 Carbine, M1 Garand, Dan Wesson PM7 1911