What's in a name? The term magnum is relative. Compared to a 308 Win, the 30-06 is a magnum. They are all various sizes and shapes of cases that push 308 cal projectiles. If you like the nostalgia of the 30-06 that's great.
The stnd 06 should be able to do what you want but you could do an AI. Doing wildcats is a fun thing (love of labor) for the most part because there is usually already an existing case to do the same job ballisitically. I.e., the WSM or SAUM will do what the 06 AI will do.
I think the Sherman case are a great inovation and you could do one for "neat" factor, but I think if I were going to do an 06 AI I would use 06 Lapua brass. (No offense Rich
If you want something a little more than the 06 you might consider the SAUM or WSM or even the 300 RCM which I think is a pretty cool cartridge. Pretty much right there between the 06 and WSM and good Hornady brass. Just pretend the "M" part doesn't exist