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What's with all the "Mks" of US Navy WW2 Bofors cartridge cases?

jeff w

Well-Known Member
It seems Navy 40mm Bofors cartridge cases are the most common WW2 dated case you run across here in the US. I believe I have seen war dated cases marked as "MKI" thru maybe about "MK5 or MK6"???
I know almost nothing about Navy ammo - can someone enlighten me as to what the different WW2 bofors case MKs are and how they differ from each other?
 
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