I don't see why anyone would want the 30-378, or the warbird, or the lazzeroni, or any of the 300mags besides the winchester. Alright, I can make an argument for the short action magnums, because they let you use a smaller gun if that suits you, but other than that the 300 winchester magnum has been around a long long time. The factory loads are great and there is SOOOO much information on reloading the 300 winmag that you could try a different elk load every day for a year. Do you really see a difference in field performance? With the 300 winmag you can take the biggest elk or moose at rediculous distances if you can hit them. I just don't see the point I guess.