I was working on early Remington 9mm boxes and noticed all but one of mine have cartridges with nickel primers with a U stamp. The exception is a box of HP loads with . The copper primers with the U. it is the earliest 9x19mm box style I have documented. The date code is difficult to make out but I believe it is January 1916. The earliest Remington box I have with nickel primers is dated April 1917. I also have, boxes with nickel primers dated Sep 1917, April 1918, three in 1919 and two in 1920.
If anyone had a date when Remington changed from copper to brass primers, please share that information with us.
I am also interested in the date codes on any early Remington boxes that have a first letter of the date code with the first later from C through K and the type of primer used for the cartridges in the box. Since the change in pistol primers, perhaps all primers, likely occurred about the same time, caliber is not important, though I’d like to know it just for reference.
All help will be appreciated.
PS: Here is a copy of the box.