went something like 29/13 with 31 kills confirmed using:
M1216 Long Barrel Fast Mag Lightweight Scavenger Dexterity Perk 3 Greed Extreme Conditioning Bouncing Betty Shock Charge
headshots are one shot kills, extreme close quarters are 2 shot kills, everything else is a 3-5 shot kill out to about 50 feet, fires four rounds consecutively, clicks the barrel, four more shots, starts with 16 shots.
Scavenger with this gun is mandatory, but adding shock charges and betties makes scavenger that much better, shock charge toss range gives you a chance to gapclose the stunned enemy, plus you can cover your flank with betties.
All in all this setup gives your shotgunner control over the battlefield at much longer ranges than normal.
Still debating if Extreme Conditioning is worth two points, if anyone wants to test or give their own thoughts on the build after trying it, please do.
no, apparently my information was incorrect, I simply noted that point blank headshots DID result in 1HKs, which has nothing to do with location, just the range of the shot, apparently headshots dont do extra for shotguns.