Ray,
Are you talking the .338 Win Mag vs the .338-06? Is the Remington 700 long action the same regardless of magnum or standard cartridge? I thought I had to go with a standard cartridge because my stock is inleted for my current .270.

Also, though the .338 win mag may be the perfect Elk cartridge, I have had good luck with my 7mm mag, haven't lost an Elk yet. But I have to admit there has been occasion where it took more than one shot to anchor it down right there. One the other hand I have a one shot kill on a much larger bull Moose.