Boy this pains me to say, as I am a pretty big 338-06 fan.
Since you already have a 30-06, I think the 9.3x62 is the way to go in your situation.
Woodleigh does make a 320gr soft/solid.
Not that it matters, but I also have a couple of 9.3x64's and a stable of 270's with no 30 caliber anything.
