Well my plan is to allow the bull access to the chute. Move him down past where the butt board goes and when he passes it, to slip it in place. Then get to the front of him (all this done outside the chute for safety) and make him back up to the butt board and then slip chest board in place. Then I add the feed bucket just behind the chest board. While he eats cow feed, hopefully I can get 2 shots in his neck. The shots I believe will go ok, it's the nasal does of "Once PM In" for pneumonia that I am concerned with. Him moving his head might be a problem. Unless I can keep him interested in the feed. Then maybe I can squirt in his nose. I am working on this now. I plan on a dry run first to see if the boards are set up right for his size. Once he eats what I give him I open the side gate and out he goes. This has been done with careful planning and every has to be done outside the chute. I'll post pics when we vaccine him. I believe it will work and work good.