Doug - Ross did indeed do an article or two on patching jacketed bullets to get the correct size for odd sized rifles. His results were shown to be very good.

As with any handloading practise, start low and work as pressure signs indicate.

Note, that .308", .311", .312" and probably .313" bullets are available as well. Adjusting the patch thickness will produce a variety of finished sizes. Running a patched and lubed bullet through a proper sized sizing die, should iron the patch onto the bullet more tightly.

Another possiblity is using a Lee sizing die to reduce .323", 8mm bullets to .320" for your rifle.