Photobucket is blocking the pictures and it is too late for me to edit the above posts. So, let's see if we can put the pictures here like this....

7.62x54R and .405 Grenadier. The Russian round supplies the parent case for the .405 Grenadier:

Left to right - .45-70 case, 7.63x54R cartridge, .405 Grenadier cartridge, .405 Grenadier case:

.45-70 and .405 Grenadier, both with 300gr bullets:

Published factory muzzle velocities for .444 and .45-70 were made from 24" or 26" "test" barrels.
Therefore, all muzzle velocities used for the below cartridges were "normalized" to a 22" barrel.