50BMG Headstamp Question

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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.
 
TSUSA has some of the best prices on LC M33/M17 and the Hornady match stuff. For what your rifle cost, I wouldn't shoot anything unknown or semi-known. Start a new thread and ask where to dispose of them. That always turns out fun.

ETA: Congrats on joining the 50 club. It's a ton of fun. What optics are you using?
 
I was about to post up the 35 count LC51 and 21 count Misc rounds for sale. Thought someone with a single shot might be able to pop them off without so much work cleaning. Or someone can use the parts.

As for what optic:

Not something to reach out to 1000. But, for my purposes. It should work without coming apart. With my eyes and nerve damage. I won't be pin point anyway. Just barking squirrels after 200
 
Assume the primers are corrosive and clean accordingly. Post pics of that Bad Larry.
 
Larry has 70 round cans of IMI 661 gr ammo for $200 plus tax and shipping

 
Can I ask another question? The rubber barrel bumper is cracked in two spots. Contacted Barrett. This is their response to how it happened.
"This can happen when the barrel springs and barrel key are pressed against the bumper during storage, or during installation of the barrel key."
Does this sound right? Makes no sense to me. He did say, it was installed correctly. The damn thing is supposed to be a buffer on the barrel under recoil. The gun has very few rounds out. I ordered two, I do not like not having a working gun.
 

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