well lets not forget still muskets and flintlock weapons are in, so havin an rcf with a butt attack provided it is ancient i think it's ok.
These clearly aren't regular muskets and would have to be breech-loaders to be usable at any sort of speed. I dont think they have 3 barrels, one of the splash graphics has a 3 barreled pistol but thats a clockwork gun.
You can combine shot and a compressed waxed pellet of propellant into effectively a rudimentary caseless round. Modern muskets have propellant cakes that go with a primer (or in some cases a peizo sparker, electric detonation). Gals could have something similar... where do you get the sparker... from a regular old budda smokes lighter.
The Reload speed should go away.
They're single shot weapons.
The reload after every shot is factored into their attack costs.
"Reloading" the musket is tantamount to having more rounds in hand to quickly stick in it. Its like the Grenade Launcher in Resident Evil... its got a unlimited capacity, you can stick all the grenades in it, etc.
Olde Shotgun with birdshot very likely Does have 4 barrels all lined up side by side just because of the weight of that thing (its like 11 pounds, my dad had a 20 gauge single barrel shotgun from Rossi that weighs 5 pounds).
Handcannons and Boarding guns are a game balance thing but its supposed to be Professional piratin tools, which you're not worthy of as pirates till later. Imagine the Handcannon (due to weight) actually does 50 damage like a shotgun shell pistol, except without the +Armor nerf that Muskets have, so it does 40 instead. You're lobbing probably an .80 or .90 caliber ball with that thing making as big a hole as a shotgun slug. The Mil. AP shotgun shells do 45 matey.
Same thing with Boarding Gun, its like a belt fed shotgun firing slugs. Factor in the +bravery and its 45 or 50 damage too. Its literally what it says, a high damage SMG for close quarters work inside ships and urban enviros, to one-shot stop anyone or threaten and put down similar ubers. Crude, heavyAF but effective.
Both are probably Rifled as opposed to smoothbore, and they're clearly firing Brass Jacketed bullets which means probably high pressure. The Boarding Gun clearly uses Wadcutters as standard too, perfect for killing an uber.
The thing I want changed?
Weight of Gauss Weapons especially the Pistol. Not that I care for it statwise but because it makes zero sense for the civilians to use it. Feeble human soldiers and operatives would immediately Nope out of it and request XG guns, or the engineers would "scale down" the size to fit human physiques.
conservation of momentum doesn't apply when you're accelerating BB or Flechette size projectiles to 40-100 kilometers per second, inside mass-inhibiting micro gravity fields. Gun doesn't need to weigh 15 pounds.
Pistol would be a PDW, and it checks none of the marks of a PDW (capacity and ammo interchangeability, light weight, range). Nobody would use it, and Power Armor goons would use a Rifle/Sniper.
I always interpreted Gauss Weapons (TFTD style) to be Beam Weapons similar to star trek Phasers (like the ones from Undiscovered Country at least). Not a projectile but a super-laser with extreme overpenetration and impossible to reflect with shiny bits.