In the current 0.51 Exp, all 4 variants of the shotguns have 2 bugs. Please note this is not a rant or general moaning, I genuinely believe this is a bug and not desync, lag, player error e.t.c.

Bug #1 - They are close to non-lethal.

Examples: I shot a player yesterday that was either AFK or Combat-Logging, I was close enough to interact with him/her, about 2m away and yet it took 3 shots to the chest to kill them.
I have also been shot by the MP-133 4 times repeatedly at just 5-10m while being chased and taken very little damage.
There was also a video uploaded by a popular YouTuber yesterday, whereby 2 players in the same room (Top floor room of a pub) fire 4-5 times at each other at just 2-3m hitting chest and head before either one died.

Bug #2 - Even at extreme range, shotguns ruin every single item in a players inventory. Even at ranges where you don't take any health damage, every item, clothing, backpack and all contents is ruined.

Example: Wednesday evening I logged into a server after a restart and the server had rolled me back so I was in the street in Vybor outside the Police station, I immediately saw a player at the Vybor Gas station, he turned towards me and fired 1 shot from the Double Barrel shotgun which hit me. I took virtually no health or blood damage, my statues said Healthy just a few seconds after I had been shot, but every item in my inventory was ruined, excluding my rifle in my hands.
According to DayZ DB map that's a range of 50m, so only 1 maybe 2 pellets could hit me, yet everything was ruined.