Most demonstrations I have ever seen for bullet proof stuff and vests were very specific about the ammo they tested with. Especially vests. You almost never see tests of bullet proof vests with various calibers.
True enough. I mentioned the Garand because the test reminded me of a (possibly apocryphal) tale of G.I.s who had captured a Nazi staff car late in WWII. They found (through carefully monitored destructive testing
) that the bullet-resistant glass in the car would stop .30-06 M2 ball but not AP.