Having butchered 20 something moose, up to 1500 lbs or so, and roughly 75 caribou in the field, many of them (moose included) by myself, alls I got to say is snatch blocks are for pussies.
Smart pussies. But still pussies.
I have been known to run a loop of rope around a tree to use the double leverage to get moose's back leg up and tied off for gutting, however.
Pulleys.... Faugh!