Rereading I am very vague on my original post. Let me expand.
doubles drill
Fire 2 rounds pause fire 2 rounds pause ... repeat for 4ish runs
Aiming at the same spot on the target.
Fire the second shot as fast as you can, do not wait for sights to settle/confirm sight picture. Looking for jailbait splits.
You are looking for patterns in the shots. Pending the patterns you adjust your grip accordingly.
5-7 yards is ideal distance as you do not need a perfect sight picture to execute the shot. As your dispersion gets small that no visible pattern is showing, increase the distance.