To be fair about dictating rifle ammo, the US provided large amounts of ammo in exportsin WWI and WWII and imorted much less. I'm not saying this is a sufficient reason by itself, but it's not inconsequential.
FWIW, in my Weird WWII campaign, the Atlanteans dumped 10,000 assault rifles similar to the E.M.1 (in. 276 Pedersen) on the US Army, after the flop of them offering an assault rifle similar to the AK 47 (chambered for the. 30-30 round). The PCs actually prefered the "Atlantesn AK" -- if they wanted a more powerful automatic weapon, they broke out the BARs ...
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