I'll have to go ahead and respectfully disagree with you. The 338 Win is much more than a 350 yd cartridge. I wont post up a bunch of comparative drop charts to make a point, but pick a few of the decent BC. 338 bullets and run them through your app or program. You'll see that it compares favorably with 300 mags.
I know it can be argued that energy isn't necessarily lethality, but it's no trick to get a 225 grn @ 2800 that'll still have 2k of energy at 500 yds.