mystery nato ammo

phillip61

Sergeant
Banned !
Full Member
Minuteman
Jun 14, 2012
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texas
A guy I know came across some ammo but don't know how to figure out what grain it is without taking one apart and weighing it. A plain brown box that has an "HP" inside a circle, below that it has this, 20 cartridges. Cal. 7.62X51 Ball.

Another person said it was 147gr. M80. Is there a way to know for sure? Thanks for the info.