The weapon damage weightings in Bad Company 2 have been off since day one. There have been a few tweaks here and there, but the fact that a bolt action sniper rifle doesn't necessarily kill with 1 shot is ridiculous, especially when your opponent is carrying an assault rifle.
The latest problem I have seen is with the SPAS-12, although several times in the past few weeks I have fallen victim to this with the Neostead 2000 so maybe all shotguns are effected. Basically, if you equip the SPAS-12, 12 Gauge Slugs (12G.SGN) and Extended Shotgun Magazine (SG UPGR) you end up with a shotgun that has sniper capabilities. What do I mean by that? Check out this quick video I recorded. You're best watching this in fullscreen 480p, otherwise you might have difficulty seeing what i am shooting at. Yes, that's how far away I am and hacking is for fucking losers - I would never use one.
Just.Fucking.Stupid. I'm not sure if this will be corrected in the next patch, but given the code is already out for the consoles I am not sure that it will be. Oh well, at least I know how to make it a level playing field if I need to. But the gameplay will go to shit if everyone just becomes shotty whores.