Here’s another iirc. (Also some personal refrence)
The last time I was in a shooting competition (I am just a rank amateur) we had to do a woods run. In which you had to move through a wooded area engaging some standard targets with a “double tap”. I was using a .22 pistol for the competition that had a scope on it the size of the barrel so it had a negligible amount of recoil. After the course we could review our targets and help reset for the next shooter.
Bringing me to my point. I am a fairly decent shot but on average the spread of my two rounds was 5 in. That was just double tapping, but all of my shots were about where i had aimed. The Mozambique drill puts two rounds in the center of mass and one round in the “head / neck” area to ensure that the target stays down.
The way I could see this playing nicely would be in a progression sort of like this:
Double tap / triple tap / Mozambique / other advanced drills.and maneuvers by “difficulty”
It would allow a character to have a measurable progression of skills and be “realistic” as putting two rounds in rapid succession into a target is easier than three is easier than two and a headshot.