ok, here I go.
First it's for RM/RM2.
There's an optional firearm attack table, an optional firearm/grenade fumble table, an optional shrapnel critical strike table, an optional grenade attack table.
That's for individual combat.
For ship combat there's some basic rules along with a chart for ship weapons, for ship weapon attacks and critical strikes.
My personal feeling is that it is more for Fantasy Heroes than for RM... ( at that time lots of genre books like that from ICE were dual stated for RM and FH )
If you look for just black powder tables, you're better of with 10 Million ways to die. ( RMSS though )
As a side note I checked At Rapier's Point and it contains the same tables for firearm combat.