If zombie apocalypse ever happened, the last gun I would think of using would be a fuckhueg colt python.
I mean, this is like most unfitting weapon of them all because:
Only 6 bullets per load. (maybe 7 or 8 if modded)
The recoil. (ill give pass on that one, he obviously knows how to shoot it)
Loud as fuck.
Cumbersome reloading unless you use speed loader, and even then, it is a stretch.
Uncommon ammo.
Heavy.