Any good alchemical source books out there?

[SuperJebba]

I'm starting a campaign as a gunslinger. I'd like my character to craft some sweet guns and awesome ammo for himself as he kind of eschews magic. The problem with alchemy is that it kind of tops out at alchemist's fire and dragon's breath alchemical cartridges.

I'm curious if there are any rulebooks out there that contain rules for a more diverse assortment of alchemical items and more powerful items.

Thanks in advance for your help.