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Having said that, generally, a highly recommended level of armor protection is “Level IIIa” or even better — “Level III (hard body armor)”. Level III body armor is designed to protect against rifle calibers up to 7.62×51 or .308 Winchester at a velocity of 2780 ft/s, as well as all lower level calibers.What are the different levels of body armor?
There are 5 threat levels for ballistic body armor but for most applications the two levels that are significant for soft body armor are Level II and Level IIIA. Level III and IV are for hard body armor plates designed to protect against projectiles at rifle speeds.