Mine shoots Speer 70gr HP over a lighter load of Varget very good. I have yet to try out my Nosler 100gr BT but I got them loaded up and ready.
Tim is right, those Power-Shocks shoot great in the 243's, and they are cheap too. Around $10 or so, depending on where you go. My local Walmart carries them for $9. It's good ammo and I love Federals brass.Very easy to work with.
-Aaron