Lets talk Iron.

So, Unique to the setting is the use of primitive black powder weapons. What types of pistols/rifles are available? Musket and pistol obviously, but what about other likely variations? The blunderbuss for example? Could I purchase or have crafted a pistol style blunderbuss? Perhaps even use some skill in engineering to develop a hand grenade? where is the availability, capabilities, and limitations of this game changing substance?