I don’t reload so I can’t tell you about a load.
But I think Remington usto load a 30-06 down to a light 30-30 type load
In there reduce recoil line.
And if your up to adding a kids rifle the 350 L is very light recoil I think about 1/2 of a 243 with a lot bigger and heavier bullet.
My son’s rifle is near exhibition quality, I eschew mass produced low quality stuff. Every kid gets one “forever” rifle and shotgun before they leave the house at 18. So the focus is on getting the wonderful rifle he already has into use with a mild recoil load so he can stop using the pre-64 .243 and start using his rifle.