I would post this in the gun section but I think I would get more replise here.

This year is my siters boy first year hunting and hear in Montana if you are under 14 yrs old you can shoot a cow about any where there is a general elk season.
My question is my brother in law is limited to the guns he can use,and asked me if I could loan one to him.I have several rifles he can use but wich would be the best for his age(he is 12 yrs old,Large kid about 140 Lbs,stout but dose not like recoil)
Here are the choices
1. 243 win (100 gr. Nos.)
2. 6mm (100 gr. Nos)
3. 25-06 rem (115 nos or 120 core-loks)
4. 30-30 win (170 gr. Flt-nose)
5. 280 rem (160 gr Nos.)
6. 30-06 (180 gr. Nos)
I have bigger rifles for me but not much for young shooters,I started out with a 30-06 w/180 loads,but he can' t handle a 20 ga. 3" mag in my wife' s 870.So what do you guys say.His dad can' t aford a new rifle and he uses the only 270 win my colection.Let me know what you would use.