Probably about the time I was 25, I had a Thompson Center Contender with a 256 Winchester Magnum barrel (that's a 357 mag case necked down to 25 caliber, but you leave all the powder in the case!! Muzzle velocity was an easy 2300+.

) While I was going to put a scope on this thing, all I had at the time were iron sights, and my mother, who was a bird person and had several bird feeders in front of the kitchen window, noticed that there were cowbirds coming to the feeder. Now cowbirds are the bastages of the bird world, and they find the nest of a bird of another species, roll the eggs out of the nest, and then lay their own in the nest and leave the other birds to raise their own young!! Plus, they're ugly black and brown anyway.
So I'm wandering around outside, and see a cowbird land on a pine tree next to the bird feeder. I had a clear shot with a hill behind for a backstop, and I'm probably 35 yards away, and line up the shot the best I can with the iron sights and pull the trigger. There is an enormous KABOOM!! with a 256 and this 10" diameter baby sun appears in front of the barrel, and the bird just settles down on the branch a bit. NUTS!! Missed him!! #@&^&&(^$^#&%#$^^*%*&$%$@^ (HammARspeak) So I walk over expecting the bird to fly away, and it just sits there. Get a good close look, and the upper back half of the bird is GONE. Just sheared away by the sheer hydrostatic force of the 256 bullet.
Okay, now I had a dead bird on my hands. I holler for my mother's cat, who was an incredibly leathal hunter, and dangle the mangled bird in front of him, and problem solved!