The 1 in 11" twist works very well I'm told by an owner. (PM Rigbyuser or search his posts). I have no idea what TSE have planed. I guess you can email them with suggestions.

My 9.3x62 has a 25" #4 contour barrel with a muzzle dia. od of 0.650". I am very happy with this contour in that calibre and it balances very well in that rifle and the .333 is only a bit smaller.

A .333 hole in that profile would provide a thicker wall and more weight. To balance, a 23" or 24" barrel would be about right.