Thanks for all the help guys.

The only reason I shot back that far is because it was pushed to me and was on a fast move.
I was in the process of pulling the trigger in a small opening.
I couldn't move the gun with the deer.
That being said, it was following six doe so I had tracks going everywhere and we didn't really know which ones were the bucks.
We made circles around that area for hours and then gave up.
The Buck broke off from the rest of the does when I shot.
The does stayed together and went out across the hill.
We believe the buck got back on there trial, because we could find tracks going anywhere else.
We followed the tracks for about 75-85 yards with no blood.
And gave up.
I wish he had went further.
We are in the middle of a 10-12 inch snow storm in PA right now so I have to wait for it to clear, then go out and look for it.
It was the biggest buck I ever shot at in the 13 years that I hunted.

Two of you said that a heart shot will make it kick both legs back like it did.
How far can a buck go on a heart shot?
I thought they couldn't go far and that a heart shot would bleed a lot.

Oh yea, I shot 4 more times at it but they weren't good shots.
It hung in my area long enough to fire some more rounds.
Everything happened so fast, and I had a little buck fever.
As it ran away I heard it crash once and then louder a couple of seconds later, making me think I hit it.
But for the life of me we couldn't find blood.

The crashing and the kicking make is sound like a vital shot but why couldn't we find blood?
I killed a lot of deer and everytime I had a blood trail.