........... "I noticed a spare mineral feeder had been knocked around the lot"...
Clue #1.... which says something is not good in his world. Could be many things but, most likely an animal in heat near by was picked up in the wind...or by sight...(current or recently).
I have never seen... a good breeding.....bull that would not become cantankerous to some degree under some circumstances. He must be avoided until he settles down.
We keep bulls in the corral behind 2-1/5" thick wall tubing and when a cow is brought in for breedng they must have a scuffle thru the bars. The ones not selected repeats this several times. For some time after, we will not go into their pen less we create a confrontation. That doesn't suggest bad attitudes it represents frustration.
...."so I started dragging it behind the barn and the bull comes up and sticks his head inside the feeder and his head gets stuck for a few seconds when he gets free he goes nuts and starts pawing the ground and wanting to charge me for some reason"....
Clue #2...if he was sticking his head in the feeder while you were dragging it...he was being agressive...and took that as a challenge. Animals are not normally that anxious to eat mineral(as opposed to dry feed being put in the feeder). What was the emergency that mandated the mineral feeder be moved at that moment rather than ...later...next day?
...."I picked up a board, and some nearby sticks and start shouting at him he backs up a little and I run behind the barn and make it to the bed of the truck and he comes over and butts the truck bumper a few times before leaving"...
Not a good scene. You were not prepared and he was given the opportunity for the upper hand and they will take advantage. Animal husbandery suggest never get into a confrontation with an animal unless you are prepared and can win. To loose is to invite further challenges. That is not good...for you or the animal.(you are apparently safe)but, a good bull,perhaps, must now meet his..."water-Lou'...(sp?) as a result. I would have presented the bumper to him in an agressive fashion(short of breaking legs)and finished the job with a 5' fiberglass control tool out of the truck window...until he went to the other end of the corral. The ear is vulnerable and it hurts. I would never go into a pin without my stick,which they have become to know.
"This was a close call as I pinned by a 5 strand fence, the barn and the bull, I have my mind made up the first opportunity when I have help to load him he's leaving the farm"....
If he is a bull you wish to have a round try this. Create YOUR controlled environment and let him know FIRMLY who's boss...AGAIN. If he is back to normal most likely it will work and you can regain control and respect. A couple times may be required and should be done soon and close to each other. DO THIS ONLY IF YOU ARE CONFIDENT AND AT YOUR OWN RISK.
Just some thoughts on animal management.