Quoted:
I believe that was actually for 7.62 CETME cartridge and not .308
7.62 CETME is very much dimensionally similar to .308 winchester.
However, it is loaded at much lower pressure.
(much like Japnese 7.62x51 for their MBR)
7.62 CTME is dimensionally identical to 7.62 NATO and was only developed to aid in full-auto controlability. While 7.62 may or may not have seen use in second-line converted Mausers, they were converted for full 7.62 NATO and nothing else.
H.P. White labs has tested some of the Spanish Civil Gaurdia Mausers to failure only after a proof load that was several times SAMMI .308 Winchester max. And the same misinformation has been bouncing around the net over the Civil Gaurdia rifles, Israeli converted Mausers, and the FR-7 and FR-8, and the Indian Ishapore .308 Enfields since before there was a worldwide web on rec.guns and mail lists.
The basic conversion as done, with the small ring Mauser action is SOUND for full 7.62 NATO. However, that is not to say any one individual rifle of the type does not have headspace problems or other flaws. However that's the case for any milsurp out there under the sun.