My father-in-law ruined a nice steel target...
He, I, and my brother-in-law (his son) were shooting one day, and they had brought their pistols to shoot. I had not yet purchased one, but they were working on me to do so, so they brought thier pistols and a nice brand new (BIL's) steel spinner rated for handguns and medium caliber rifles.
So BIL shoots his 9 mm and klanks off nearly every round at about 20 yards. FIL steps up to the plate with is .357 mag to "show him how it's done". He shoots and misses.
The target did not so much as twitch. Another shot, another clean miss. Some mild cussing and discussion of re-sighting ensues. Finally he decides to shoot the 4 corners to see which way he is missing. Nothing, nothing, nothing and nothing!
He uses an expletive or two and then starts digging for a large paper target. His dutiful son-in-law wanders over to check the target while the range is clear and finds the problem. There is a brand new looking target with 6 holes exactly .38" in diameter all the way through the 3/8" plate!
FIL had to buy BIL an new spinner, but I got off worse... I had to go buy a .357 mag!
I suppose this was not such a blatantly ignorant thing, but if one researches the reason for the .357's design, it could have probably been avoided. They were an upgrade to the .38 special during prohibition so the police could shoot through the car doors the tommy toting rum runners and bank robbers were hiding behind. I still don't think I would have expected 3/8" plate steel would be able to be cut clean through without so much as a shivver!