This HH example has a cylinder for 12 capsules with a considerable caliber (over 14 mm).
Could it be that 2 gr stands for 2 grains and not 2 grams. In any case, if this gun was made to shoot blanks, the amount of powder would be (much) less than for shooting a projectile; notwithstanding it needed to be noisy for the show purpose.
We ignore how these pistols were positioned in their niche; could be that they were introduced through some kind of orifice in that only the fairly long barrels stood out the boat hull, thus giving the impression of a cannon, as the HH caption seems to suggest.
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