.22x64 using 40gr GS bullets (similar to TSX) at 4700fps muzzle velocity.
entrance:
exit:
.243 with unnamed "premium" European bullet:
entrance:
exit:
The .22x64 bullet was travelling approximately 1400 fps faster at impact. The white tail buck I shot with a .257 Wby and 75gr A launched at just under 4000fps had very little bloodshot meat. It looked like an auger had bored a hole through the deer behind the shoulder. It was very interesting.
entrance:

exit:

.243 with unnamed "premium" European bullet:
entrance:

exit:

The .22x64 bullet was travelling approximately 1400 fps faster at impact. The white tail buck I shot with a .257 Wby and 75gr A launched at just under 4000fps had very little bloodshot meat. It looked like an auger had bored a hole through the deer behind the shoulder. It was very interesting.