How about the 9.3x74R necked down to .30 caliber? That would shove a 180 or 220 grain bullet to good velocity with out much pressure. One should keep in mind that really high velocity wears out barrels faster and DR barrels are not cheap to replace. I would settle for bringing back the 300 H&H Flanged Magnum. If it's just the ballistics, I've seen Drs in 30-06 and 270 Winchester.