My take is that the original Whelen was an answer to the shortage of magnum actions. The improved forms AI & BW were at least in part designed to eliminate the myth that the Whelen didn't have enough shoulder to head space on and the second idea was to try to turn it into a .375, which it isn't.

All of them are good cartridges but I think if I was going after the type game you are talking about I would think about greater magazine capacity before I would do anything that might affect feeding.

If I wanted to really get looney I would do a 35 x .375 Ruger AKA 35 Newton just to be different.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli