I agree with RR, your rifle will tell you. Remington, Hornady, Winchester, Federal, etc.. all make good ammo and either make or use good bullets. Now time to find the right combo.

I would suggest using the heavier grained bullets for whitetail deer. The 85 grain Sierra Game King hollow point is a good lighter weight, but with the .243 you really need 95 -100 + at least in my opion.