Hi Fernando
Your first bullet mold is quit a heavy thing
I can't imagine that any particular soldier would carrier it with him, also the fact that it has 3 calibers in it would sugest some other use (shotgun?)
In case of a shotgun it could be explained, since some shotguns had 2 barrels with different calibers. The 3rd caliber could be buckshot?
At the first sight of it i thought immediatly about a german mountain man of some kind, with his double barrel shotgun hunting game , but i do have a significant fantasy