Longest shot? Not quite. But luckiest guess? Yes.
It was the 90's. I had no money, so a 3-9 Leupold was all I could afford. Forget a rangefinder. Not in the cards.
Dead cow in the middle of a field. Coyote eating the cows backside.
I get down on my bipod, can't see the coyote for the terrain, but, I can barely make out the hump of the bloated cow.
I calculate where the coyote is probably standing in relation to the bloated cow belly. I held over the horizon about 36" guessing that there was going to be a yote there when the bullet dropped in, let one loose and smacked him.
I couldn't reproduce that shot if I had to, but I did pull it off once.