Production:
Live in a 10 round limit state.
Can get reliable, widely available, competitive gear (Glock 34) for little money ( less than $700) and over the counter (no gunsmith required).
Can use least expensive, readily available caliber 9mm for both practice and competiition and still be competitive.
No real need to reload (time, space, equipment).
seems to be the most time and cost-effective division to do a lot of realistic practice, I.e. I am trying to spend more money improving myself than improving my equipment.
Finally, my 2 favorite shooters, Stoeger and Vogel compete or first made their mark in this division.