Honestly, if you just find a load that groups best in your rifle, any expanding non-varmint bullet from 80 to 115 gr and good shot placement will get the job done on whitetails as well as any other.
IF you don't handload:
In .243, I've had great luck with Sierra Gamechanger with their 90gr TGK. Every rifle I've fired this stuff in has loved this ammo! I've killed a few critters with it and terminal performance has been impressive.
I also like Hornady Precision Hunter with 90gr ELD-X, though the Sierra Gamechanger has grouped a little better in my .243.
IF you don't handload:
In .243, I've had great luck with Sierra Gamechanger with their 90gr TGK. Every rifle I've fired this stuff in has loved this ammo! I've killed a few critters with it and terminal performance has been impressive.
I also like Hornady Precision Hunter with 90gr ELD-X, though the Sierra Gamechanger has grouped a little better in my .243.