I have to say, I don't like this drill. Flinch is only a problem when it happens before trigger break. (or where the trigger would have broken - ie anticipation flinch). The common outcome of this drill is to see a good smooth trigger squeeze - and then, when the gun doesn't go off - a WTF flinch. The WTF flinch happens just about the time the bullet would have been hitting the target - no effect on the shot at all. It's difficult to not confuse the two.
Dry fire practice and hard concentration on tracking sight movement have served me much better. I still suck by most standards, but this part of my training is going well.
Rob!
I've actually had great training success with the GSG 1911 (.22LR). Recoil management aside, there are no better drills for FTFire, clearing drills than with a .22LR auto pistol. Back when I was shooting a lot, it became second nature that all 1911 issues were cleared safely and efficiently without as much as a hiccup. Couple that with either speed or accuracy drills shooting .45acp and you'll be able to manipulate and shoot as well as 95% of shooters out there...some here are in that upper echelon of the 5% (pro, semi pro) and for them it's a different game...we cannot relate to the what and why's of what they do,but more power to them.