My dad killed an elk at 304 steps with a .270 and it ran 20 yds and fell. Shot placement is key. Also do you reload? If you reload you could reload more powerful .270 cartridges and give you all the more help.

If you get him shooting well it wont matter. If he can hit the 14"kill zone on an elk it will go down.

Plus there is relatively no recoil depending on the gun.