Sorry but you are mistaken. The M60 was never chambered for anything other than 7.62x51 NATO (308). The Navy converted M1919 machine guns from 30.06 to to 7.62 so maybe that is what you are thinking.I was in the Navy 1968 to 1972, 52 years ago and I know it was a 30.06 belt-feed with a tripod , what was it called M-???.