The shot went high and you clipped the spine by the shoulder and went above the lungs. I'd bet your rifle is sighted in for a much longer distance.
Had the same thing happen to me years ago when I had a .30-06 sighted in 3" high at 100 yards. I was hunting farm country and last I saw of the deer was when it was running at full speed over 400 yards away.
Bullets open more violently the closer you are to the game. It's simple velocity.



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