I have tried a lot. The most success and accuracy between 3 different .243's that I have has been the Winchester super x 100gr. Good groups and good performance for the money. I have tried the xp3 and they perform even better but they are a little pricier.
Look no further than factory Federal Fusions. I shoot them in most of my rifles. They are bonded bullets without the bonded price. Better performance than standard cup and core bullets and plenty reliable for deer sized game. No need for the premium stuff for Pa whitetails but I would step up to the Fusions over the basic cheaper factory offerings.
I support all hunters, regardless of weapon or technique!