Which leads me to the next question. Steel casings were introduced as a cost (and strategic materials such as copper) saving measure, right? That is why Germans introduced them in the later part of WW2, while the Soviets started using copper plated steel in 54R since the 30s, and by the end of WW2 was the only type of case in that caliber.
Well, than why the Soviets (and later Russians) never switched from brass to steel in the case of 12,7x108? Especially considering how much material (brass) is contained in the larger cases? Could the reason be because that (maybe, my speculation) laquered steel performs badly in high rate of fire systems such as Berezin UB, Afanasev A-12,7, Yak-B aviation machine guns?
I mean by the 1970s and until today all mass made Soviet ammo ranging from 22LR to 30x165 is steel cased, except for 12,7x108. I dont understand why.