I'm taking my 13 year old, ballerina daughter to Front Sight for Spring Break. She's strong but only as big around as a twig. I want her to get as much from the class as she can and not worrying about being beat up by the gun. I'm thinking of having her shoot my 23 with an Advantage Arms 22 conversion for the class. Do any of you have experience putting lots of rounds through one? Are they picky about ammo? Any other advise?