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For more on marking an answer as the "Best Answer", please visit our FAQ.Ok, I was being facetious.
Ammunition use was generally based on the number, or poundage of �shells� used rather than rounds of bullets. However, I did find something on WW1:
The expenditure of munitions on the Western Front 1914-1918
Expenditure of small arms ammunition for pistols, rifles and machine-guns (usually using rifle calibre rounds, e.g. 0.303-in.) must have reached hundreds of billions, if not trillions. A single, water-cooled, belt fed (250 rounds) machine-gun such as the British Vickers - said to be 'slow-firing' at 450 rounds per minute - would expend, theoretically, 25,000+ rounds in one hour of continuous firing. There are reliable reports of one such machine gun actually firing 12,500 rounds in a single afternoon on the Western Front. The limiting factors were over-heating and barrel-wear. This could be reduced to a certain extent in some models by the proper use of the water-cooling system; water-cooled machine-gun barrels were said to have had a 'life' of 35,000+ rounds when used 'judiciously'.
Further info here:
http://www.westernfront.co.uk/thegreatwar/articles/factsandfigures/ammunitionsupplies.htm