I have the same rifle as you, in .243, and so far I have tried 105g Geco and 100g Federal PowerShok. Both group well on paper at 100 yards, and the PowerShok have taken my first four deer.
I have just picked up a box of Privi 100g (the last box the dealer had) just to see how the cheaper stuff shoots. It'll probably be a month before I get a chance to try it though.
Note, this is my first centre fire, I have shot a few more either at the club, or other stalkers' guns, so bear in mind my lack of experience. However, I am delighted with it!