[Black Powder]

I think that 1,160 figure refers to the overall length of the weapon in millimeters. The muzzle velocity appears to be the 810 figure in meters/sec.

What the website says in German is 810 to 1,160 m/s depending on the weight of the projectile.

Since one meter is slightly larger than yard, we can multiple by three and roughly estimate the maximum velocity to be 3480 feet/sec.

[nightdriver]

I'd really like to see the 308 load that would produce 3480 fps. Have to be less than a 120 gr bullet or some pretty hot double-base powder. Never seen a 308 throw 150 grains over 3000. 'Course, I ain't seen it all, either!

[FreePaul]

maximum velocity to be 3480 feet/sec.

Actually calculates out to slightly over 3800 fps. Pretty high.