I'm wasn't saying I agreed, I've shot 308 from FR-8's with zero issues. As long as your headspace is fine, there shouldn't be any problems. Here are a few pages from folks that feel differently though:
http://surplusrifle.com/shooting/fr8/index.asp
http://forums.gunbroker.com/topic.asp?TOPIC_ID=422284
It's much like the 223 vs 5.56mm debate.