Howdy Ned,
The Cherokee Cowboys do let juniors shoot .22's and .410's at our monthly matches. The .22 ammo must be all lead (most of it is). Our targets are made of T-1 and hung at an angle, so target damage or bounce-back isn't really a problem. We have some pretty young kids shooting (9-11), and some of 'em shoot .38s and 20 gauge shotguns.
Bellicose Bill