Well I just purchased a CZ-858 and a crate of surplus ammo but i just noticed that the crate says 7.62x43 and the headstamp say BXN 43... Is the No. 43 just the No. from the producer and the rounds are 7.62x39, like I'm pretty twisted right now and i've been trying the make sence of what i'm reading about it but it's not making much sence right now!! Somebody please explain this to me! Thanks