Remington and ruger make .243 youth models. My wife shoots the remington 700 youth model in a .243 and can shoot awsome groups out to 200 yards. The action on the gun is very stiff but the trigger is adjustable. These youth models are great for people with shorter arms and statue. I might add, that I love to carry that .243 when I still and stalk hunt. It' s extemely light and easy to get around in the brush and no recoil.
I also have a 25-06 and it' s a great gun but the longer guns will be a problem for the smaller folks.