.50 AE The "found" caliber

[crazykiddeath]

CDDA>data>json>itemgroup then the ammo JSON is the file I think you’d be looking for.
This:

Guide to adding new content to CDDA for first time modders

The Guide to Adding New Content to CDDA for 1st Time Modders now lives on github and you should follow that fine hand-crafted link to the current version. This thread is meant to provide a quick, accessible overview of how to add specific features to CDDA. It’s intended for people who want to add a thing, but don’t know where to start. Hey, what if CDDA had a new way to craft an item (a recipe!) new item! new location! better NPC dialogue! new quest! new monster! new morale effect! new…

should help.