I'm with vapodog,
I have a 338-06 imp rifle, and i'd not do it again. I really don't think it's worth it. The fact that the cases are harder to make alone, negates the little improvement in performanse. I can't see case life improveing either.
The std. 06 case design is one of the best ever designed, and if it was me, i'd leave yours as is!!
Drilling Man