Barrel Proofs & Old English Numbers...?

I am a bit stumped and coud use some help.


Some barrels are marked as either "172,28" (meaning 7.65 cal.) or as "118,35" (meaning 9 mm).


These marking are some indication as to how many bullets (of a size caliber) can be made from a pound of lead. I think I have this part correct...


Without knowing "Old English", how do I interpret these numbers ? The "comma" between the numbers is throwing me for a loop. Does "172,28" mean that a little over 172 bullets of 7.65 cal. can be made from one pound of lead ?


Thanks in advance for any help...