Geno,

Yep, that was the original 250-grain Barnes X, and yes, you should be able to use a little more powder safely with the TSX.

In my CZ 9,3x62, I generally seat all spitzers just shy of magazine length. So far they've all shot well.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck