If you want something for marksmanship development and you don't think you can find a steady source of .22lr ammo, can I suggest you get a air pistol and a pellet trap? Before I had a house, my apartment had a long hall, which was perfect for air pistol and air rifle shooting.
If you are interested in marksmanship development and want less felt recoil from a firearm, you probably want a larger, heavier pistol. My daughter likes shooting .38 Specials through my 5 inch barreled S&W Model 27, but hates shooting .32 acp's through my Walther PP.