>>718378290
That's why you get Spuddy and the Sigil of the Hearth and go bullet farming in Rise and Manufacturing.
I often get a water barrel on my back and sprint at full speed towards grunts and one tap them with a heavy melee sprint attack. After 1 or 2 runs I got plenty of ammo to use on stuff.
I also did spend like an hour running laps while reloading a scrap shot over and over to get to Reloading 20.
If you press and hold R you can unload your current gun and reload it for XP as long as you have exactly one bullet in your inventory. my friend told me you can just hold R and it will unload but I didn't get it to work unless I had 1 bullet left I'm fairly sure XP gain is based on how much of a magazine you reload and since the scrap shot has a magazine of 1 you are always reloading a full magazine for some 40 xp (+4 with order helmet, +4 with Sustenance Soup and some extra by eating a human brain)