May i suggest Fernando that, the name of this ammunition would be 'bouquet' ? That would at least make some sense, as this is a type of 'fragmentation' bullet that seems to burst like a 'group of flowers'.
We can see and read in the drawings that the 'mother' bullet is composed by 'fragment' components; the 1864 version being more complex, with outer fragments and inner cores.
Probably the purpose of the rifling in the first section of the blunderbuss barrel is to complement this projectile effect.
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