If any bullet doubles in diameter (or even gets close to 2X original diameter) and exits the game, all the damage you can do is done. So energy figures are 100% unimportant if you are getting exits. Will good 100 grain 25 cal bullets exit deer? I think so, but I don't know for sure. Others here can probably answer with certainty. The only 100 grain bullets of .257" I ever killed game with were late production Remington C-Ls and they won't get out the other side of doe antelope (4 of them, so I am pretty sure that's common performance for them)
However the 115 and 120 grain bullet do very well and my daughter and both my grand-sons have killed bull elk with a 257 Roberts and 115 Branes TSX and 120 gr. Nosler Partitions, and several of those bullet exited the elk. So if you speak of deer, I doubt you'd have a thing to worry about with any expanding solid or Partition from a 257 Roberts..
Last edited by szihn; 05/04/21.
