What Mauser has to do with it is simply that Sweden chose to use the cartidge in a Mauser based rifle,while Norway used the cartidge in the Krag rifles.
This led to 2 different cartidges the 6,5×55 Krag and 6,5×55 Mauser.
The only real difference being safe operating pressure, as the Krag rifles
has they’re limitations.

If looking into it one would also know that after the Sauer 200 STR, were introduced and set as the standard for all of Scandinavia, the new label is 6,5×55 SKAN.

What is commonly referred to as 6,5×55 Swede in the US, is the 6,5×55 Mauser configuration.

Also the achieveable velocity with the 140 gr bullets is posted on the low side.
You can safely run it at higher pressures with modern rifles and powders, and the factory ammunition and pressure limits are kept low so it is safe to use in the small ring M96 rifles.

A 140 grain bullet can comfortably and safely be run at 2800-2900 fps, in a modern rifle and a simple look at reloading data from Lapua will give you a nice ballpark figure for velocity.