[Magnum Wheel Man]

just sold my 600 several weeks ago, & had it apart for full cleaning & did a couple short action 700's the week after... I was not trying to compare them, & it's been several weeks now ( memory is not so good ) but I don't think they were even remotely similar under the wood... I'm guessing that it would be tough to fit a short action 700 stock on a 600 action ( of coarse anything is possible with enough bedding compound )

have you tried a company like Richards Micro Fit ??? I'd bet you could get a very reasonably priced laminate stock that is correctly inletted for the 600 from them...