I use a sling for practice, and have taken several animals that way. However... I'm not a fan of hasty shots - especially for Wyoming Antelope.
Because Wyoming uses ambiguous definitions, and allows "field interpretations" by wardens, these definitions can cause trouble with hasty shots:
Wyoming Fish and Game 2010 Antelope Hunting Regulations said:
"Buck Antelope" means male antelope with visible horns and a dark cheek patch at the base of the ear.
Wyoming Fish and Game 2010 Antelope Hunting Regulations said:
"Doe" means an adult female antelope or adult female deer.
The keywords are "male" and "cheek patch".
Even if you
know it's a doe... If it has a cheek patch you didn't see before your hasty shot; you just shot what Wyoming considers a buck. Shot a doe with no cheek patch, but discovered it to have horns, later? ...Still a buck, according to many wardens. Shot something that didn't have horns, or a cheek patch? ... If it has male reproductive organs, and is older than a yearling, it's still a buck.
Between the positive ID required when hunting Doe Antelope, and my personal preference of hunting methods... I tend to sneak in, sit down, and scope out the herd, before choosing my target. Having a bi-pod or set of shooting sticks is a nice bonus.
In my case, a stable support is almost
required, as well. I suffer from familial/essential tremors, which cause me to shake constantly (think "parkinson's"-like shaking). Standing shots are a poor choice, as I can't be 100% sure of shot placement, and won't take a shot I'm not sure I'll make.
Utah/Idaho Deer, Elk, Antelope, Moose; or Wyoming Elk, Deer, and Moose... I'll take a hasty shot all day long.
Wyoming Antelope? Hell no. Allowing wardens to interpret the definitions is a necessary evil, but it makes hunting Doe Antelope a bit more complicated. I've seen more tickets written for Does with cheek patches, or bucks with no horns and no cheek patches, than anything else. (And these are the honest people, that kept the animals - not the guys that see a cheek patch or male organ, and stuff the body in a badger hole!)