Congratulations on a really nice rifle. I load for a buddy who had a Remington MTN rifle in 270 that shot a 5" group with factory trophy bonded bullets, and he was content with that! I on the other hand about tipped over.
I worked on a load and now it shoots 3/4" groups at 100 yards and works perfectly. Your just going to have to try some until you find what it likes or start loading.
Some Federal's in the 165 or 180 gr. Accubond might be worth a shot!
Good luck. Sounds like a keeper! The rifle and the wife.