A 270 is a versatile cartridge. I guess "it depends" on what your intended purpose is? Deer? Elk? Boars? Black bears? Brown bears?
For deer, any "standard" bullet in a 130 gr weight would work fine. Pick a load that the gun shoots into good groups and make sure your knife is sharp. For elk, I would choose the heaviest-for-caliber bullet in a "premium" design, like partition, accubond, TSX, A-frame, etc.
Pick up half a dozen different 270 loads and take it to the range to find what the rifle likes to group. Maybe your B-I-L can "spot you" some ammo to test in your rifle?
I have a Stevens 200 in .223 rem. It shoots way better than it should for the price tag.
Enjoy your new rifle.