J. Gill is right, of course, The movement of factories beyond the grasp of the enemy in China and Russia was nothing short of miraculous. Also, there is the factor, which I forgot to consider, that the expenditure of large quantities of ammunition did not begin with what we, as Americans, think of WWII. China was at war, either Civil or against the Japanese, long before we got into the war. Also, while the guys in the CBI area did a marvelous job of ferrying supplies over the hump and the Burma Road, they could not move in the amounts of ammunition on C47s, etc. that you could bring into a big port on ships.
Still, they seemed to have large stocks of 7.9 ammunition, but I can readily see what they bought from Western in the mid-years of the war (42,43 and 44). Probably that filled the need along with whatelse they could scrounge or make themselves. It still doesn’t surprise me that 7.9 was not obn the list, despite the number Of Inglis 7.9mm Brens, Czech versions of the Bren (well, yes, of course the Bren is a version of the Czech gun, not vice versa) and Mausers in that caliber, not to mention belt-fed weapons.
Glad I was too young for that war, with VJ Day being probably my first really vivid memory in life.