A Varmint bullet in the neck would probably make a mess and might kill the bull if you hit the right spot. My uncle killed several this way with 55 grain soft point factory ammo [Remington and Winchester] This is typical a heavy for caliber bullet in the 22 by today's standards. I don't know if it took more follow-up shots or not- I do know that he was unable to use any of the capes as they were recked.
