I chose the best throwing body I have, but I don't know about the grog. It is Redstone, From Highwater. very happy to stand up tall and get thin.
Highwater's description of Redstone: "This is a rich, reddish brown body with a lot of character, warmth and excellent working properties. Use for hand & wheel work. 6% fine kyanite." So, it may not be the smoothest body. Kyanite has good thermal shock properties.