.5 Vickers bullet diameter question


#1

I have two British Made .5" Vickers rimless rounds. One is stamped “K.39 F.I.Z” and the other “K.42 B.I.Z” The bullets are both original, the only problem is, the F mark 1Z bullet diameter measures .510", and the B mark 1Z bullet meaures .513". Is there any reaon for this? Was there a manufacturing tolerance range for the diameters?


#2

THAT BULLET DOES NOT GO WITH THE “B” HEADSTAMP.