6 or 7 calibers. Some are on backorder and some are available now. (243 and 6.5 Creedmoor)
http://www.cabelas.com/browse.cmd?CQ_page=30&categoryId=734095080&CQ_search=thompson+center&CQ_view=list&CQ_ztype=GNP
http://www.cabelas.com/browse.cmd?CQ_page=30&categoryId=734095080&CQ_search=thompson+center&CQ_view=list&CQ_ztype=GNP