It's probably not relevant, but I recall reading in maybe Hatcher's Notebook that the die stamping of the maker's marks on the brass had a side benefit of work hardening the brass. I don't know if the absence of it makes them softer or if whoever made them to additional steps to make the cartridge head harder. Just something to ponder.
Phillip McGregor (OFC)
"I am neither a fire arms nor a ballistics expert, but I was a combat infantry officer in the Great War, and I absolutely know that the bullet from an infantry rifle has to be able to shoot through things." General Douglas MacArthur