I have tried the 180 X in the Whelen IMPROVED I shoot, and it goes out at 3050 fps and based on case head expansion and primer pocket tightness, as well as primer appearance there is room to go, but why?
I shot an elk at 204 yds thru the lungs with the 225X (non XLC/TSX) and it put a quarter size hole thru both lungs. It hit between the ribs going in and out so nothing hard was hit. The elk dropped at the shot. MV was 2750 fps and impact was around 2200-2300 FPS or so.
I wrote earlier I get 2800 fps with the 225 XLC's, and as someone responded, it is "screamin'" however it is definitely a safe load. My top XLC load gets to almost 2900 fps avg. I do have a 26" bbl on my custom Mauser 98, and as it is so accurate I couldn't bear to have the the gunsmith shorten it. That sure helps on the velocity.
Barnes is not kidding when they say you can get 125-200 fps more with the XLC.
I want to try the TSX 225, but I have such a good supply of the others to use up. Honestly, even the plain old X bullet at 2750 fps (225 gr.) is all I need. The Whelen or Improved vesion won't equal my .300 Win in trajectory no matter what I do, so I have a super 350yd gun in the Whelen Impl and should I need more range, the 300 Win Mag gets the nod.
Not a bad choice either way!