Not all “old school” JHPs held together, and penetrated deeply. Some fragmented violently, such as the Federal Hi-Shok 125-grain .357 Magnum, as manufactured in the early Nineties. I know, because I read the autopsy report. Being a police officer, I had an opportunity to see all of the relevant paperwork, when my supervisor showed it to me. “Hi-Shok” was not a typographical error. This worked very well, for a frontal shot, into a slender human.
Today’s .357 125-grain JHP bullets, intended for .357 Mag velocity, should be constructed to hold together, much better, but even so, I would probably want something more substantial for defense against a feral hog, which would be the largest likely four-legged threat, in SE Texas woodland environments. Hogs usually run, but a home health care nurse was killed by one or more feral hogs, in her clients’ driveway, one county to our east, in Chambers County, Texas, not long ago. A feral hog being pursued by dogs BROKE INTO my mother’s garage, within this county, Harris County, in a semi-rural, suburban environment, a few years ago, ripping a hole in the siding. (It was inexpensive, relatively thin ply-board siding, and there was no inner wall or insulation, so this was not equivalent to a “home invasion,” but shows the strength of a cornered feral hog.)
Cougars and coyotes are local, but ammo for human adversaries is adequate for such thin-skinned animals.