Re: 7mm stw fans
Welcome to LRH!
You will find lots of 7STW fans here (myself included). I haven't worked with the 140 gr TSX but I would think 3400 fps or maybe more is attainable out of your barrel length.
I tend to be a little on the conservative side with my loads, so you may get some higher numbers from some of the other guys.
The critters have to win every time, I only have to win once.
NRA Life Member