Just purchased a M82A1 Barrett. It came with some ammo. I am trying to find out about what I have. Whether or not to shoot it. A kaboom with this will,not be good. Looking at the headstamps.(middle picture) The first 3 are Lake City? The number 3 made in 51? The 4th Israel? The rest not so much of a clue in the rest of the pictures.. As for the one without any marking is the mystery round I guess.

Any help would be greatly appreciated

Side note. I have a few that the bullet is not secure. It spins in the cartridge case. Wonder if those should be not used. I do not reload for 50BMG. Much less have a puller that big. I have two that have primer strikes and need to figure that out. I have seen what a round can do to a hand.



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Answer:
Most of these cartridges (TW 53, SL 43, FN 53, LC 51, MKE 64, RV(E) 49, Chinese blank) have corrosive (potassium perchlorate mix) primers. You will have to scrupulously clean your Barrett with water based bore solvents to avoid lasting damage. Every component surface exposed to gun gas - barrel, bolt, firing pin, receiver interior, magazine lips, magazine follower, etc.

The LC 19 and ת צ 74 are non corrosive.