I've never heard of anyone using it for hunting. There are, however, people who go out to the desert with them to target shoot from long distances.
You need to get out more....
There was an incident at Fort Carson several years ago where some GI's shot and killed a bunch of deer with the .50 that was mounted on their jeep. (this would have been in the mid-eighties) Needless to say, they got in just a little bit of trouble. I heard about the incident through an officer that was there when it happened. I lived in Colorado Springs at the time.
Target practice. VERY long range target practice. Like 10,000 feet. It is based on an anti-aircraft round. Extremely expensive rifles. You need a friend with a rangefinder next to you and at least 3 rounds for practice. Very loud. But, if you happen to hit a moose, lets BBQ! I'm hungry!!
If you don't dislocate your shoulder first!