I would believe that most THR folks are somewhere between 3 and 4 for most of their collection.
With the greatest humility and meaning no disrespect to anyone, I do not.
I see a LOT of shooters. Many of the shooters I see are regular competitors who spend more time with firearms than any sort of "average" shooter, participating in pursuits that rate their performances up against their fellows and which strongly encourages exertion and deliberate pursuit of improvement. I still would not say that most of THEM are somewhere between 3 and 4. A
few will be solidly 3. A
VERY few will be in the 4 category. (Which I am not claiming to be, myself, by a serious margin.)
To get a sense of what I mean by "Mastery:" When I was pretty new to practical pistol shooting, I watched a fellow who later became a regular acquaintance of mine win a regional "Sanctioned" IDPA match. He beat over 100 other shooters, overall. Not only did he have the fastest corrected time, in a match requiring about 120 shots, he was down
THREE POINTS. Total.
I've shot matches with Jerry Miculek, Dave Sevigny, and other phenomenal masters who's names are a little less well known, and seeing in person what is possible casts the rest of the spectrum (including your own performance, believe me!) in a whole new, stark light.
I'd say the definitions maybe are something like this:
1) Competence -- safe with the gun and knows how to make it work.
2) Proficient -- Accurate with the gun. Able, with concentration, to perform most shooting drills and tests adequately.
3) Expert -- Knows how to RUN the gun. Unconsciously competent. Can execute a drill, course of fire, or apply a shooting solution without having to put mental and physical effort into the mechanics of what the gun is doing, leaving the mind and conscious effort free for strategy and decision-making.
4) Master -- ONE with the gun. Seeing and hitting are one and the same. The gun is an appendage of the body and the bullet is an extension of the will.