Well it's not like you haven't already posted your actions this turn.
Also, I think Sheb just completely abstracted the BFLG's damage to 60% chance of One Hit Kill and 30% chance of Wounding (unable to fight) for any unit it was fired against - no save. Presumably this includes a 10% chance of missing the target (and maybe just destroying a nearby orphanage or something equally unimportant). See the Techs section of the OP for details. I gather the point was that the damage is enough to OHK pretty much everything short of an underground research bunker (and that only because of the half mile of rock in the way) - the miss chance isn't due to insufficient damage as much as it is due to the difficulty of aiming the damned thing.
The number of shots is slightly confusing, though. Sheb's put one shot from the cannon per day, but that was before he clarified how long turns were. I don't know if this means you can do one shot from the cannon per turn, or up to 31 (month depending) depending on how many slugs you have. Quite possibly the latter, since you'd need to ship or mine out slugs which would serve as a greater limitation. Also it would let you just build up resources for a few turns and then obliterate a weak empire's defences in one turn. (Unfortunately, probably mine.)
Also, to RAM: Interested in renegotiating those borders we drew up? I'd be inclined to renounce my claim on all those territories in Africa I'm not already occupying in exchange for High Tech Lab Equipment (that is to say, agreeing not to expand any further than I already have). Research roll bonuses are always useful.