Ifn ya gotta shoot indoors, trick an ole AMU instructor taught me....
1. works better with a simi than a wheel gun
2. take a standard lead pencil...shim it up with tape till it centers in the bore.
3. make some ink imprints with the eraser on a sheet of paper
4. stand with the point about 1-11/2" from the paper...using the ink mark as a target ( will appx the sight picture of a 25yd pistol target)
5. cock/sight and squeeze trigger, firing pin will knock pencil forward into paper...the point marks will appx the size of groups at 25.Works great on sight picture and trigger control.
With a simi, this is a breeze with the wheel gun, ya gotta pull pencil forward to rotate cylinder (use only on single action)sounds simple...I usta do this for hours. Still, nothing beats live range fire.
Dan