Not sure if this is the correct place to post this, but I can move it if so.
I'm not sure if this is entirely possible, but would it be possible to calculate the durability needed to be immune to specific calibre of weapons? I find it really common in fiction that people are often able to tank bullets, without so much as flinching, and being able to get durability feats from these seems really useful. The following ammo types should probably be done if so:
- .22
- 9mm
- .44
- 5.56
- .45 ACP
- 7.62
- 50 Cal
- Shotgun Shell