Had a friend shoot a raghorn 4 point bull elk straight on in the chest with an original 140gr X bullet at fairly close range (30 to 40 yards). It was launched from a 7-08 at approx 2,800 fps muzzle velocity. He recovered the bullet back by the kidneys. The next year, he took a black bear in Alaska with the same load -- here's his description of the bullets perfomance.
I took a very nice
blackie around 300 lbs at just under 300 yds with the same load. Took
him quartering away through the near shoulder, broke that, took out 1
lung, then continued on up the neck, turned "in" at the skull, and
actually exited the offside ear. Pretty impressive I thought for a
nominal 2800 fps load. It's quite accurate in my Ruger OM M-77, but I'd
probably use the Triple shock now for some less fouling. Those old X's
were rough on copper deposits!
Paul