What was your farthest shot and what caliber?

[Cobra]

A Woodchuck at 457 yds measured with a steel surveyors tape on very level ground with a witness. Used a 220 Swift with 55gr Nosler BTs about 10 years ago, early spring during thier digging out period and are stupid. Hit it with the 3rd shot, it just stood there wondering why the dust was exploding next to it. Believe I 've had a couple farther (500+) but never measured them so they don't count, no witness either. Generally don't get to shoot that far in Southern Michigan very often, it's hard enough to see them at 100yds once they get into the fencerows.