I killed 2 antelope with 30 cal 125 grain BTs 2 seasons ago. Both at about 140 yards. One bullet exited and one didn't. Both antelope dropped at the shots. The one that didn't exit broke up and the jacket was against the neck skin with a several pieces of lead. Slight angle, with the bullet striking behind the shoulder and going forward stopping at the base of the neck, about 4" in front of the opposite shoulder.
The rifle as a 308 Winchester and I chronographed the speed at 2914 fps at the muzzle. At a bit slower speeds I bet the rounds would go somewhat deeper. I'd bet you'll be just fine.
