6.5 cm is more than adequate for anyone. I use a .308 and have shot several large bulls and they died immediately. The furthest one went about 10 yards.
That's awesome! I've killed quite a few critters with 6.5 CM and haven't had any complaints. A suppressor or brake definitely helps with the recoil.
You're definitely being nicer then my dad was. He threw a 30-06 in my hands and told me to take it like a man