Ah.... Hmm, I read that wrong. That means other people will also read it wrong, though. Maybe something in the notes section saying that it loses the Splash, or something like +3B/+0(-S).
Following the format of other ammo types like Air Burst and Incendiary. Air Burst has a damage code of -1X/-1S, Incendiary has -1B/-1CS. These are not subtracting the splash effect but adding it.
The Special Game rules for ammo types on pg 284 do say that the letter codes are replaced if they are different but not if they are the same or simply not present, like Burst damage. Problem is that there's no "normal" damage code and it would be overly complicated to add it in, IMO.
Just my thoughts.
- Shane