Backwoods 7,
The 7 mag and 300 WM are really close in performance. Yeah sure there are more .308 diameter bullets rather than .284 diameter bullets on the market. But who really shoots all those different bullets? Most folks find one or two favorite loads and stays with them forever! My recommendation would be for you to pass on this deal. You already know what you have (in quality and performance) in your 7 mag; you don't really want someone else's problems!? Parting Shot: keep your 7 mag and buy yourself a .338 win mag for Xmas!!!