As I tried to make clear, my knowledge of the problem with the .458 is anecdotal (see http://www.african-hunter.com/WhatsWrong.htm). I have never had any difficulty with the .458, either with factory loads or with hand loads. Nonetheless, I still consider rimmed cartridges, loaded to appropriate pressures for DR's, superior to rimless for use in DR's.

I forgot to mention the .470 as a possibility in the Krieghoff rifle, although the relative scarcity of bullets makes the .470 less desirable from the handloader point of view.