I haven't tried the PR conicals (yet), but like you I LOVE their sabots - best thing going. I would expect the conicals to perform every bit as well. I've only shot the Hornady Great Plains & No Excuses conicals out of my Knight, but found they give good accuracy with about a 10 to 15% reduction in powder charge when compared to a sabot round of similiar weight.
For example, with the 460gr No Excuses conicals, I use 90gr of 2fg 777 to get results like these:
http://community.webshots.com/photo/66414501/246963016bjAsVbnormally I'd use 90gr of 777 with 350gr sabots for best accuracy.
Good luck & let us know how they turn out if you try them.