You might want to also find out along with these answers, "what caliber did you start out with and have you ever been able to hit the broad side of a barn with a handgun?"
Certainly there are outliers and freaks but anybody who tries to learn with a big caliber is doing it wrong. You have too many potential (hell, likely) bad habits to pick up with handgun shooting as it is, why the heck would you want to increase the problems?
[ETA] First was a new S&W Model 17 K-22 Masterpiece 6" bought at Mainz Kastel, West Germany in about 1982.