Good advice from all and I would steer clear of using a 9mm for putting down deer. I have carried a 9mm while hunting, but that was a force of habit with no plans to use it on the deer (carried a .308). I don't see any issues hunting deer with a pistol, but your selection, experience and ablities need to be honed; a stoked .357 or 10mm would be about as small as I go. I won't knock the Hi-Point, but you accuracy at 25 yards needs to be pretty darn good to even ponder the use of a pistol on deer.
For me, the pistol is an emergency tool only with the primary function of getting me to my rifle
ROCK6