Sorry I only have secondary knowledge from an acquaintance that used to work on knife proof vests. He built test rigs and when he inspected the spikes used for approval, he said the tip still looked like a single point no matter how much (optical) magnification he used.

[–] thanksforallthefish@literature.cafe 2 points 4 days ago

Not the person you're replying to but this gives a good rundown.

Soft armour (ie what can be worn under a shirt without being TOO obvious) can be up to level 3a (HG2)

https://canarmor.ca/nij-level-meaning/

https://canarmor.ca/product-category/coverts/

[–] vaultdweller013@sh.itjust.works 1 points 3 days ago

10mm is a weird caliber that is kinda in a weird niche overlap where it's okayish at a lot of things but isn't great for anything in particular. Better to go for 9mm P+ if you are thinking 10mm hell even .357 magnum or .45 ACP would be better off as a whole.