In Korea, a fire started on one of the machinegun ranges, and the Korean civilian range control guys tried to fight a fire downhill, from an uphill position...they lost that battle, unfortunately for them, and perished in the flames.
Not that this is even close, but for trigger control, sight picture, manipulation of the mechanics of the firearm, I use a 22 conversion - which is dead accurate in cqb situations. I have also found that using a 22Lr is less intimdating with the kids I work with. They get a different bang using .223, and they love it.
I am not saying this is an end all solutions, but for round down range using Buis and other optics seems to give trigger time that I can afford. Also, a good instructor is worth 50 shots for every one shot unsupervise