I found a 180 gr Ballistic tip, launched from a Krag, to put them down decisively. Due to the distance, and the open sights I took a body shot, thinking the relatively slow velocity wouldn't tear up a lot of meat. Wrong
OTH I helped one guy look for a turkey that he'd shot in the neck with a .270. Where the bird was shot we found bloody grain from a blown up crop spread over a 5 foot circle, then a blood trail a blnd man could follow for 30 yards, then it just disappeared. The hunter was dumbfounded the bird got away. I keep wondering if a bobcat or lion grabbed it and carried it off. It should have been DRT.
It's also interesting to think about something that will decisively kill deer, yet not tear up meat on turkey. I'm told a .54 cal round ball will do it. A drilling found be a fun handloading exercise, too...
Glocks are good guns. All they need is a manual safety and a carbine conversion, and you'll have something worthwhile.