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Greetings Shooternz,
I had heard much the same. About 1980 I bought a can of NL4831 packed by CAC. The original surplus 4831 ran out about 1972 so perhaps this was the new 4831 made by Nobel's hence...

Greetings All,
A better way to date Dupont IMR powders.
My old can of IMR4064 is marked:

P79SE27B

I believe this means the powder was packed on 27 September 1979 by shift B. This was also...

Greetings Kiwi-Adam and Zimmer,
A little digging produced the following.
First IMR4895 was only marketed by Dupont from about 1962. The markings on your can indicate it was made from the late...

Greetings Wanneroo,
In the post war years .30-06 war surplus cartridges were broken down and the powder and brass salvaged by NZ hunters. The powder was mostly 4895. I was given a tin of it in the...

Greetings Kiwi-Adam,
If the AR2208 is in a plastic container, factory marked AR2208 then it is less than 20 years old. If the metal can of IMR 4064 is marked Dupont it is quite old, at least 30...