It would likly use a Ghordson breechlock shutter type mechanism, where you’d use somthing like a lever action to pull back and eject the spent shell in order to load the next. The barrels likly got to have serricsteel in it somwhere even if its only alloyed, otherwise you’d need to keep changing it after it deformed.

Mixing it up with somthing like a Alchemical Goggle sight spell convergence engine, would sort out the need for a spotter somewhat.

So, in essence you want to make something more powerful then the Vanar Liberator, hmm? The .50 cal Barret isnt enough, so you want to upgrade to 20mm? lol

Well, let’s think. Bigger barrel = bigger shell, which also means alot more powder to fire a heavier round. Also, if going by current military standards, weapons of this caliber can only be used effectively as a two man team, and it would be impossible to use the weapon in anything but a prone position, or without the bracing of cover. The good news is that this could work well with a Sniping Shot ability, as it forces the user to hide, and can be devastating as a x3 or more crit multiplier.

Now, just as i had done, it would be highly recommended to use sabot tech on this gun, as trying to load something of this size would have to have a cannon check, and not small arms. Although this greatly increases the cost of the round (likely over 300G per shot), this would reduce reloading time dramatically, and would offer stable options for ammo type, such as the Plate Puncher ammo i have here.

And don’t rule out the option of a breakdown customization, where the stock and barrel can be broken down to a more transferable and compact state, and come up with how many rounds it would take to put it back together for combat, that way the user would have to think carefully about setting up prior to a fight.

See, my DM offered the idea of producing Serric rounds for use against ‘Jacks (our party is average of lvl15 and we’ve been playing for the past 2 years, so we have the money and resources), but i wanted something with a bit more punch. So, taking examples from modern day firearms and artillery, I thought about the actual design of the round and how i could calculate that into useful stats, coming up with the +3 against high armor class and the higher crit multiplier.

Now, I dont know if there are specific stats for alchemicaly hardened ammo for use in IK, but if you have any ideas, please share them.