My two best shots are.
A crow at 320m with a .22 rim fire it was so far away that it heard the shot, had time to jump in the air and flew about 2ft to the left and right into the path of the bullet.

My next “best” shot was I was looking for a Rabbit to feed my dog but I only had 6 shells left for the 12ga, there were Bunnies running around everywhere I was nearly tripping over them. I was waiting for the perfect shot so as not to wast any shells, when a Rabbit burst from under my feet. Naturally I aimed and fired and sent it tumbling, but when I picked it up it was only about 6” long “I had shot a kitten” so rather then carry it back by the feet, I put it in my back pocket.