O.K. I've been gathering pieces to put a bolt gun together in .308, hopefully sometime in the next couple months. My friend has the tool shop and equipment but neither of us has actually re-barreled anything. I have a Winchester 670 currently in 30-06 that has stepped forward for the project. I have a new #7 contour Shilen CM 1-10" .30 barrel and just ordered a reamer. The reamer is actually a new Manson but is labeled 7.62 Nato. I did this just to muddy the waters some more I guess. I have read as much as I could stand on .308 vs. 7.62 but really come away as dumb as before. I think I am clear on the fact that the true 7.62 Nato chamber is a longer headspace than .308 and it is unsafe to shoot commercial .308 in a 7.62 chamber because of that, but ok the other way around? My question is if we ream with the 7.62 reamer but use .308 go/no-go gauges are we effectively still cutting the shorter headspaced .308 chamber? Since both cartridges headspace off the datum of the shoulder why are there not specific reloading dies for 7.62 Nato? This gun will never see anything but reloads from me so I can make them fit correctly but don't want to leave something behind to whoever that isn't safe with commercial .308. Any help to this would be appreciated.