Practice shooting from a sitting position, Elbows reting on your knees, bone on bone.
You are not shooting groups, you are shooting coyotes. Then put your cammo on and try it.
Some guys I hunt with use two sticks, crossed and tied with a strip of leather as a rest when sitting on stand.
Finally, be prepared to take an off-hand shot! I have had many a calling session where I never see a coyote until I stand up. There they are, 50 yards away! Shoot fast before they realize what you are!
Remeber, you are shooting at a target that is 8", so you don't need to put three rounds into MOA. You only need one in the boiler!