The come along have a very limited lenght to pull up the cable. Maybe 2 to 3 feet, then it must be unhooked and cable pulled back out and reset to pull again.
Single cable pull come-a-long will reach 10 or 12 feet
http://www.mytoolstore.com/app/18600.html May be yours, but mine was a double pull. none of this 10/12 stuff.
Appoligies
Just wanted the OP to know his options, as I own/use both kinds.
Single is plenty to pull a deer or elk