Wiktionary
unjacketed
a. Not jacketed
Usage examples of "unjacketed".
Luger or Mauser: but the high-velocity, narrow-calibre, steel-ceased shell from either of those just goes straight through you, leaving a small neat hole in its wake and spending the bulk of its energy on the distant landscape whereas the large and unjacketed soft-nosed lead bullet from the Colt mushrooms on impact, tearing and smashing bone and muscle and tissue as it goes and expending all its energy on you.