Here's my experience
I use a handloaded 150grn in my 7mm rem mag Ruger No.1 . I have taken small whitetail, decent antelope and mule deer using the Xbullet. I used ballistic tip before switching.
I find that there is a smaller exit wound with the X, which for me is just fine. Golfball size instead of softball sized from the B-tip. Plenty of internal damage, however, from a well placed shot through the rib cage. At distances from 70yds out to 470yds the animal hasn't traveled far before collapsing...never a 'real' tracking job. All shots have passed through completely.
My brother-in-law used an X-bullet in his 270wby on a quartering away antelope. The bullet passed through, with a very small exit, I don't remember how far the goat traveled, but it wasn't far.
Ron