Don't rule out getting an adult size rifle/chambering, and then putting the barreled action into a youth stock with reduced loads.
This is what I did. Bought my son a Tikka T3 Lite in 7mm-08, Bought a compact stock to put it in, and had him shoot Hornady Reduced Recoil loads thru it. Now he just turned 14 and has grown some, sold the compact stock, put it back in the regular stock and he is now shooting 120gr BTs thru it. Going this route we were also to stay with a 22" barrel and reduce some of the muzzle blast (i.e. did not want the 20" or shorter barrel found on many youth models)
