dont write off the 30 cals..My 30-378 is throwing 230gr vld's @ 3000+fps...and that aint no turd. You wont top it with a 338 unless you step upto the various 505 based wildcats (allen, snipetac,cheytac).
That said, i am loving the mild manners of the 264 and 7 mags, strayed away from them for some time, but am finding they do it just as good as the monster mags, and are much more fun to shoot. The bullet makers are finaly producing some great LR bulletts in 270 also, tho they will need a faster twist than what the gun makers are making in that cal.