Oni_Kadaki
Green Belt
- Joined
- Apr 18, 2018
- Messages
- 178
- Reaction score
- 107
No, proofmarks were a thing pretty much all along. Because longbows. And crossbows.
I looked into this for some writing I was doing awhile back. While the proofmark meant it could stop a bullet from a relatively rudimentary firearm of the time, I would NOT count on plate to stop a modern 9mm, let alone a rifle round.