7mm-08 is probably the best caliber for young shooters to start on. Better power and sectional density than the .243. It is the caliber Craig Boddington chose for his daughter and her best friend to use on a hunt in Africa. Both girls were able to shoot it well, and took several large animals with it. You can also get ammo for it at any Wal Mart, or other stores that sell ammo just about anywhere. It is also an extremely versitile caliber, sufficient even for Elk at resonable ranges. I think it offers everything you need.