I swapped a guy out of an 80's vintage Remington 700 years ago. It was a 243. He really wanted to keep it but I had a Savage Fox double that he wanted worse so we swapped. He went on to tell me that the rifle loved the Sierra 85 gn. HPBT so that is the bullet I've always used, currently over Varget. With this combination the rifle easily does 1/2 MOA if I do my part.
Over the past three years, my boys have killed every deer they've shot at with the 243 and the little Gameking from ranges of 15 to 227 yards. This has been a total of five deer with the biggest being a buck that field dressed at 182 lbs.
I have tried 100 gn. Nosler partitions but the rifle didn't seem to like them. That being said I have some 100 gn. Sierra's and some 95 gn. Partitions that I'm going to try because I thought the 85 was a little light with kid's behind the trigger but so far its performed admirably.
As another poster said, the Sierra 85 HPBT is a bullet that kills way above it's weight and I agree.