No definition of Guass rounds on the internet states what the content in these large containers fired by the Guass turret are. It can only be milk. All studies show it is milk. Skimmed, fat free, hot pasteurized milk.
[Edited on 03.30.2010 4:23 AM PDT]
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However, since using milk in it's armaments, the UNSC has come across several obstacles in using this technology on the battlefield. Some Marines turned out to be lactose intolerant, and would worry about the calorie content of the milk AP rounds before firing - was it full or skimmed milk? There was also the issue that off duty marines would often take Gauss rounds to drink with their cookies. As such, Gauss technology fell into disuse.