Our guys at Quantico have a pretty neat machine that hooks up to a gun that has a pressure sensor device attached to the trigger. Essentially, you start the computer, plug the gun into the machine and shoot. The computer screen displays a graph that tracks the exact movement of the trigger over time. You see where the shooter takes up the slack, starts the press through the resistance, when the sear breaks, and how the reset happens. It looks like an inverted V with the top being when the trigger stops at the end of the press and the bottom right leg is where the trigger stops in it's forward travel during the rest (it sounds complicated but is extremely simple when you look at it). When I was there in Dec they put several instructors on it to demonstrate. All the full-time instructors have historical graphs stored. They've also put top-level competitive shooters on it.....guys like TGO, TJ etc who have been graphed. With all of those people, not a single person has ever, ever, ever been able to break a shot and go exactly to the reset point or even just slightly past it. Only one or two out of hundreds tested even get into the area of half way between the reset point and the trigger fully forward. Most folks, including myself, come all the way off the trigger or at the very least let it get all the way forward before starting another press.
The only way you can take a shot and go directly to the reset point is by an extremely slow release that takes literally half a second or more. Obviously, that would be fine for bullseye, but not for what we do.
The guy that developed this was national PPC champion back in the 80s and has multiple state PPC championships, so he knows what he's doing. Obviously this is used most often with Glocks, but they also have match .22s, 1911s, Sigs etc with the trigger sensor mounted on them. Lots of people will call BS when it's described to them, so they go on the box and very quickly SEE that they don't do what they think they do and they aren't capable of doing it other than during an exceedingly slow release of the trigger, which is simply wasted time in any sort of shooting beyond the very slowest.