Good shooters are made - not born - Fred Misseldine
1911Tuner, Dr, Rob and others have touched on this...
When assisting, teaching CCW folks, especially those new to firearms and not all were ladies... folks found the .40 cal very "sharp" in recoil.
We had a variety of guns, in various platforms, calibers, and included different stocks on the same gun. For example six Model 10s - exact, except for different stocks ( gun fit to shooter).
Many found the "push: of a .45ACP very easy to shoot, granted the ergos of the 1911 helped, then again the .45ACP round was also fired from Sigs, and Rugers too.
.38spls were often chosen as CCWs for reasons of being affordable due to used Police Trade ins, affordable ammo to practice with ( includes someone in family reloaded .38spl) , shome just shot a revolver better, others Budget again...no magazines and such to be dependent to have a gun run.
9mm : This round was a HUGE favorite! Used Police trade in 3913s were available then, extra mags, holsters too. Granted a lot of folks sure were spoiled by the BHPs we had...they shot the BHP very very well.
Now understand many of what I did was with new shooters in a special kind of way. Single Ladies of various ages, victims of Domestic Abuse, Rape Victims, or attepted, sexual assault.
Elderly Gentleman too, many older...fixed budgets...you get the idea.
Some got the revolver first up due to a need right then. The 9mm often was next gun...revolver for back up.
Glocks, Rugers, 3913s, in 9mm ...well whatever these folks found they shot best , could afford, by golly they shot extremly well with them! Affordable ammo, recoil magagment, allowed these folks to shoot and practice a LOT.
Some hated to admit they really liked the .45 but the ammo price difference...
I shushed them, these folks were being responsible and shooting and CCW-ing.
All it took was let them see the targets of the Weekend CCW-er with a gun he was afraid to carry for fear of getting scratched, in a sharp recoiling caliber , loading and/or one expensive and hard to get OTC.
Gimme one of my gals with used 3913 , Glock 26 and WWB Personal Defence Ammo any day.