When I compare the 30-06 to the 338 Win mag, I have to take into consideration the sectional density of the bullets in both calibers. If you compare bullets of equal SD in the two and I were going to use either in the field, the closest consideration would be the 190 Grain 308 bullet to the 225 grain 338 bullet. Both have about the same sectional density or ability of the bullet to penetrate. The 30-06 would fire the 190 grain BTSP at 2725 fps. The 338 would fire the 225 grain bullet at 2915. Does this give the 338 the edge? you bet it would. Would either bullet flatten an elk? You bet it would. I was only saying that having had both calibers at the same time and using both for big game hunting, Both with those loads are PLENTY. Therefore for me the 30-06 would be down loadable enugh to be a more versitile rifle for all around big game hunting. You will also find if you talk to people that have done it that properly loaded the 30-06 will suffice for anything in NA. There are several people on this board who have taken the big bears with the 30-06. The 338 did not fill a nitch for me. For some maybe it would.

The 190 Grain BTSP is a little used and very underated bullet for the 308 and 30-06. I have fire thousands of them at the 500 meter Rams while shooting silhouettes. I have fired many at big game as well with very good results. I have used the Hornady the most.

If starting over I would bypass the 338 in a heartbeat for the 375 H&H if I needed something bigger than the 30-06 or 270-280. That would be a real step up if one is needed.