9.3,
The 10.75x68 is a cartridge which is often underestimated.
The fact is that it's (lighter) bullet is only one thou different in diameter to the .404 Jeffery, and the cartridge can be handloaded to equal the .404's ballistics.
Regarding the case, it is considerably longer than the 30-06, and is also greater in diameter and capacity.
The 10.75x68 is actually as large in diameter at its shoulder, as the 30-06 base diameter! (.470")
The 10.75x68 has a base diameter of (approx) .494" which is larger than the 30-06 by a fair margin.
Case length for the 10.75x68 is 2.670", again that's longer than the 06.

The bottom line is that the 10.75x68 can equal or better anything that cartridges like the 400 Whelen or Brown Whelen can do, and it can be handloaded to equal the ballistics of both the .404 Jeffery and the 450-400 NE flanged DR cartridges.

Photo below shows a 10.75x68 cartridge loaded to .404 Jeffery ballistics using a 400 grain .422" 404 Woodleigh bullet in a Bertram case.
A 30-06 is next to it for comparison, and a SB cartridge box.