At safe, attainable-for-everyone speeds, an '06 will reliably run 180's in the mid-low 2800's...
By the same criteria, a 300 WM will run 200's in the upper 2800's...
The 200-gn Accubond (for instance) really drills through wind and will retain velocity and energy better than a 180, as well as penetrating deeper on average.
Whether any of this matters is left as an exercise to the reader. Personally, as I said earlier, I love the 30-06; was shooting mine again today (yesterday too) out to 600+ yards. And I like my 300 WM too, but it's in a heavier rifle set up for long range.
But anyway, a lightweight sporter in 300 win has no appeal to me; it's not enough of a step up from the potent and very shootable '06 to justify the recoil. For the amount of recoil a 300 WM sporter dishes out I'd rather run a .338. Which I do.
