You just don't get any really big advantages from going from 30-06 to 8x57. The 8mm will shoot the same weight bullets of lower balistic coefficient at the same or slightly higher velocities, and with bullets 200 gr and up the 30-06 has a huge advantage. The downsides are too great for the upside of a bullet of slightly bigger diameter.

Alcohol, Tobacco, and Firearms... who's bringing the chips?