Here is the response I got from T/C when I asked their customer service.
Mr. Burke—
Thank you for contacting Thompson/Center. We recommend our Shock-Wave bullets in SuperGlide sabots, but I don’t think you can get the bullets separately (without the sabots already on them). Theoretically, you’ll get the best accuraccy with a boat-tail base and “ballistic” tip, but in reality, experimentation is your best bet. Buy just the smallest number of a few types to try and see what works best for you and your rifle. Thanks very much, and have a great day.
--Kenn, Customer Service Representative
Smith & Wesson, Thompson/Center, Walther
1-800-331-0852