Can a 1,500 fps 10mm perforate soft armor?

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I recall reading, more than just a few times, mostly many years ago when the 10mm was first introduced, that it would defeat level one body armor of the day. I do not know if that is the same as the soft body armor the OP is referring to or not!
 
I recall reading, more than just a few times, mostly many years ago when the 10mm was first introduced, that it would defeat level one body armor of the day. I do not know if that is the same as the soft body armor the OP is referring to or not!

A lot of high velocity handgun rounds will defeat level 1, including 9x19mm. It is the lowest level of protection, and basically worthless today, as the only commonly used rounds it would stop are those with sub-1,000 FPS, such as .22 LR from a handgun, .32 ACP, .380 ACP, .38 Spl., .45 ACP. With 9mm and .40 being so prevalent, it would be foolish to use anything less than II. Even IIA is iffy with 9mm ball, and will not protect from .357 Magnum or 10mm, or even fast .40 loads.

Also remember, penetration is only one type of failure. If the back face deformation is too great, a bullet that is stopped can still kill the wearer.

https://www.officerstore.com/images/nijspec2.htm
 
Who cares, can a handful of marbles in a sock kill a man without breaking the skin? Stopping a round is not the only requirement, force has to be spread out to not shock the organs and/or kill with internal damage.
 
I disagree that back face deformation doesn't matter, it certainly does! I can understand why you stopped using clay in your informal tests though, sounds like it was a PITA. I'm OK with just knowing a certain armor will stop a certain round (or not), I can deal with back face deformation buy buying a shock pad to put under it anyway.
 
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