I don't see why we need to use copper. Why not just iron, or even a new material? I would be in favor of a new material.
That's my point.
Even stranger than something not meeting the player's expectations (using iron for explosive weaponry)?
we're talking about a game with Undead, Spiders the size of pigs, Litteral hell, orbs that can teleport you, magic, and you're complaining about a gun being made of copper?
In my opinion the boomstick feels like it could fit in, but so much so that it wouldn't need the Frist to be added. I like that we've transitioned from guns to handcannons, but it should be more frosty or more steampunky.
that's why it's made of copper
Also, I agree with AMPPL50 in that it should have some sort of ammunition. Maybe it randomly pulls certain items (such as dirt, cobblestone, iron nuggets, etc.) to use.that would just be annoying, i like it just firing gunpowder, though i'm not opposed to a proper ammo.
Side note, your suggested method of re-loading would be really, really, really annoying. sense you have to go into your inventory with every shot, that also makes you vulnerable. it may aswell apply a stun every time you shoot it, just saying.