A lot of the shooters I deal with are slightly built, young and relatively inexperienced with firearms. When they go beyond .22, it helps to teach them on relatively quiet and low-kick guns. That’s where the 380ACP carbine comes in handy, likewise Aguila Mini Shells. More than .22, they would also serve the secondary role of being useful defensive tools in case of need.
Range learning goes a lot better, with less flinching, if the student doesn’t end up with bruises. Full-power ammunition can be used once techniques have been honed on lighter loads.