I haven't looked much into this (busy) but from the one picture I saw it was some cobbled together double (extremely short) barrel pistol type thing. Did I also see what looked like 2 shotgun shells in the chamber?

If say it was an extremely shortened type of shotgun barrelled type weapon, using a conventional 12/20G cartridge, even having large shot in the cartridge, this thing would have no choke at the muzzle.

The spread would be insane, uncontainable. To save me time how far away from Abe was he roughly?

Just going from this picture, this isn't the result of someone being shot with any type of shotgun ammunition, even a sawn off type using extremely short barrels imo.