First two bulls I took dropped and never moved again. Both hit in the neck inside of 50 yards. This year's bull took one through the rear of the shoulders at 137 yards and dropped in his tracks. He then got up and took another one through his right ham and ended up inside of his left shoulder. Final shot was in the back of his head/neck at about 2 feet.
Tough animals and as shown in earlier posts, sometimes they just don't show much reaction.
I learned early that if they're still standing or still looking like they're alive, keep shooting.