Shotguns fuck around indoors, pellets hit in invisible walls etc. I once tried to shoot another player in Berezino school like from feet away in entry hall but the pellets just somehow disappeared and they made the ricochet sound. At least the dude I was aiming scared shitless and logged out. :P The building and trees don't also stop bullets from time to time, making cover useless. It's real pain in the ass and makes CQC combat in cities almost impossible. I hope they fix that soon.