Where’d you hear they were buying .303?
I saw it on some link, which I did not save, where i was listed along with many others.
http://www.infowars.com/u-s-army-to-buy-millions-of-russian-rounds-of-ammo-and-popular-civilian-firearms/
Here it is.
Note the huge quantity of 7,62x39 mm.
Very odd.