If I recall correctly they were in 7mm, .30-06 and 8 mm.
There were also Argentine contract rifles in 7.65x53 Mauser many of which were later rechambered to 7.62x51 NATO are modified to use 20-round detatchable magazines for the Argentine Navy. IIRC, nearly all the 7mm ones were for the Venezuelan contract, 8mm was for Egypt, and most others were .30-06. If you're looking to buy one, an Egyptian 8mm is about the most affordable variant.
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