text:  When TSX is a very popular defensive load, an 80-grain TSX out of a 6-millimeter max is going to be going on average 200 feet per second faster than a 70-grain TSX out of that same barrel length 5.56. Heavier bullet, 200 feet per second faster. That's what we're looking for. 6-millimeter max, its parent case is the .350 Legend? Yes.