I have two, one with a pellet gun, one with my S&W 28.
The pellet deal was pure luck, I never expected to hit what I was shooting at. There was a pigeon sitting in the tree, above the steel cable my Beagle ran up and down on, and he crapped on the dog several times, and I decided to scare him/her off. I put a pellet in, and from about 100 feet away, just fired in the general direction. I hit it right in the head, and down it went, where my dog tore it to pieces. It had a nice round hole in it's head, right behind his eye..
The second one I actually tried for. We were out shooting in the desert on my friend's property. We had a bunch of water jugs and assorted junk radios and lamps, etc, too, all picked out of people's trash on unlimited pickup. We had stull arranged out far enough that handgun shots were kind of a joke, those were for us to shoot with his .357 Winchester. We were calling off shots, and I said, "I'm going to try to hit the top of the silver lamp!". It was about 250' away, and was very small, about 15" high (and made out of some ceramic stuff with silver glaze on it). I took a long time aiming, and fired, and the top of the lamp was blown off. "Wow!" my friend said. Then I fired 5 more times. I hit the dirt in front of it twice, one went off to the side, where it hit a pile of junk wood (He was finishing building his house), and the other two hit the hill behind the lamp. I never got within a foot of it. I reloaded and walked up about 50', and tried again, and still missed. Fifty more, and I hit the bottom of it, and that finished it off. I cut myself very badly on the shrapnel when we were picking up all the junk to put into my truck to take to the dump.