Don't forget the .500 Phantom, the big brother of the .50 Beowulf, and the ballistic equivalent of the .50 Alaskan (yet another very powerful big bore choice):
http://www.teppojutsu.com/
(scroll down and click on .500 Phantom - the Ghost from the Machine.
http://www.z-hat.com/The%20Fifty.htm
Well, at short-range, the .500 phantom is the ballistic equivalent of .50 Alaskan - at long range it is far superior to the .50 alaskan. And also, unlike the .50 alaskan, the .500 phantom is semi-auto.
I'll get back with ya on .35 whelen vs. .338 winmag....here...here's some reading that may help with that issue (gray area):
http://www.quarterbore.com/library/articles/33806.html
http://en.wikipedia.org/wiki/.35_Whelen
http://en.wikipedia.org/wiki/.338_Winchester_Magnum
http://35cal.com/
http://www.chuckhawks.com/35_caliber_family.htm
http://www.gunhuntermag.com/Features/040630Survived.htm
http://www.reloadbench.com/cartridges/35w.html
http://www.reloadammo.com/35whelenload.htm
http://www.african-hunter.com/35_whelen_in_zim.htm
My opinion would be that at all normal hunting ranges (out to 300 yards), the .35 whelen would be the better big game stopper..but at some point at loooong range the better ballstics of the .338 winmag overtakes the bigger bullet of the .35 whelen and so at very long (unrealistic in most cases) hunting ranges, the .338 winmag is superior.