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Discussion Starter · #1 ·
Headstamps are as follows:

311 over 93
351 over 92

31 over 82
31 over 78

61 over 66

Based on this article, I have determined the first two to be lead core.

http://www.ak-47.us/Article_Detail.php?g=content1146681053



The second two (31/78 and 31/82) appear to be steel core.

I have not been able to identify what the last one (61/66) is other than it is from a factory in China.
 

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Discussion Starter · #3 ·

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Those numbers may not mean anything about what type of round it is. Many military loads have the year of manufacture on them and the other number could be a lot number. Though I'm no expert on milsurp ammo so hopefully someone knows.
 

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All I can offer past what I already have would be educated speculation.
The Chinese are and still remain a very private country, especially in military matters so I doubt you would get a direct answer but you might try writing the Chinese Consulate in Washington D.C. and ask them if they would be willing to provide any information on ammunition production at Factory 61 during the Viet Nam conflict era.

I recommend the wording of your letter remain in a very concise format and stick to the date you wish information on, I doubt you will receive a detailed history of the factory but they may confirm the location of the plant and the type of ammunition manufactured during that era. HTH
 
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