Hmm...we did base most of it on head shots...heh guess we didn't consider it just based on ordinary fire of any other body part.
And we did get lazy with the plasma pistol and just based it on charged plasma shots =='
And oh yah...I forgot about storm bolter...
Well here's what we tested as a one bullet less also most are on headshot
Melta - on extreme close range it only does 50% shield damage and I do mean close to the point of touching close.
Bolter with Kraken
Las Canon - both for headshot and anywhere else
Plasma Cannon - ordinary fire
Bolter Pistol - close range and not a headshot for obvious reason
Plasma Pistol - Only the charge
Stalker Bolter - Close range since we found out extreme range really does lessen its damage. In a side note we discovered that Rapid fire is a waste of bullets if fired from said extreme range since the second shot becomes a glancing shot sometimes and headshot wise even at mid range with tac or asm without impenetrable it takes 2 bullets for a non rapid shot perked stalker bolter while rapid fire takes 4 bullets...well actually I know the 3rd bullet would kill but eh it's rapid fire. If Asm with Impenetrable 3 shots for non perked and 4 bullets for rapid but based on time and adjustment better to use the ordinary bolter in terms of mid and long range distance shots.
I'll be damned we also didnt test the plasma rifle...
So yah...guess it might not be a one bullet save for every ranged weapon. Sorry about that ^^