I'd never use FMJ ammo. I wanna put the animal down asap. I need expansion to do that. I had a 117 grain .25 caliber Hornady Interlock fail to expand on soft tissue once. Bullet went into the chest between ribs and out behind the last rib, good, solid lung shot. The exit hole didn't let enough blood to trail, the deer went about 75 yards and fell in the road not having enough energy left to get across the fence. I got lucky on that one. Most of the deer I've shot have dropped dead. He was one of the few that went very far with a solid shot to the vitals and it was poor bullet performance that I blame for the cause. I've never hit a deer that solid that went that far. I've had a deer go a little farther, but it was a frontal shot with a 7.62x39 and only took out one lung, but the exit hole through the ribs was massive due to the expansion of the Sierra Pro Hunter bullet from my handload, a bullet designed to expand from a .30-30 pistol barrel. I take pains to use bullets that WILL expand. I now use a Sierra 100 grain Game King in my .257 Roberts and a 150 Game King in my 7 mag. I shoot either a Barnes X 140 or a Nosler Ballistic tip 150 in my .308. Choice of bullet is quite important in hunting if you don't want to lose game. Even if the deer goes a ways, you want a large exit wound to give you plenty of blood trail. Smaller diameter .30 caliber spitzers must expand to do that. In addition to the large exit would, more energy gets transfered, more tissue gets disrupted. The only deer I've ever shot not using an espanding bullet was with the .357 Magnum using a flat point SWC bullet and it managed to leave a pretty good blood trail without expansion just due to bullet shape. However, that bullet don't have much BC and you wouldn't shoot a SWC out of a .30-06. A spitzer needs to expand. It does very little tissue damage without expansion. That's sorta why the world outlawed expanding bullets in warfare in the first place by convention and why the military uses FMJ as a result, more "humane" to shoot a man with an FMJ, less likely to kill or cripple him.
I don't use FMJ in my defensive handguns either, only hollow points. I wanna stop the fight asap.