Hunt and target shoot.
To carry it as a backup when hunting. NOTHING less enjoyable then having to play "nice doggy" and back away from a freshly killed deer because a bunch of coyotes want it and you only have a single shot muzzleloader, a bow with 1 arrow, or just a knife.
I read what seems to be the 2008 article by Grant Cunningham about the gp-100 adjsutable sights that move around with every shot, etc...
How does the 5" barrel version do these days