I have several converted guns that shoot 308 or varients of with standard trunions. So far so good however I reload for all of them and I load tot he light side. .
There have been reports of 308 Galil's failing. I have seen pics of a Galil bolt and I agree they look very close to a standard bolt but with a bigger face.
IMOO and my opinion only a 5.45 bolt in a rpk,psl, m70 trunion is likely the strongestr combination the 5.45 bolt lugs are longer that has got to make them stronger IMOO .
If I had the time, money and the parts Id love to do some improvised proof testing. Id like to see what a standard bolt and trunion can take before head space moves ir some thing lets go.