Thanks for picking up the game
In the campaign, when you choose a profession you become a professional, and then you can earn your extra HP
and Defense.. and same when you get to 100 XP you will become a hero and get another HP
and Defense boost. I can add an Errata page to explain that better.
For the guns, to be honest, when I wrote the rules I really didn't know much about wild west guns and just picked names that sounded good & fun. Not the first time someone mentioned that. I've been wondering if I should change the names for the next version of the rules and go for something more generic like Single action revolver, Double action revolver, etc ?