Made up a few pistol shot loads years ago for the fun of it before the CCI shot capsules made it easier, faster, and safer (IMHO).
For 45 LC, I used Standard LP primers, ~6.5 gr of Bullseye. seated a thin felt wad over the powder, tamping it down. fill case with shot, #9 or 7 1/2 size (that's the only size I have)to a wee bit below case mouth. Invert gas check, press open end into case till it is just below case mouth, slight roll crimp to hold it all together.
perfomance was ........iffy. Usually ended up with a loud bang, the gascheck punches a ragged hole in target surrounded by holes from the shot.
The CCI Capsules are easier and perform better. The box the capsules come in have load data on the label.
Prepare case from load data with primer & powder, then just fill the capsule with the shot size you want, seat, apply gentle roll crimp and there you are.