I've always thought a 6.5x68 demands 26 inch/650 mm barrel. To use slow powders and burn it up in the big case.

In my limited use of RWS loaded ammunition, the velocities were high. .375 H&H Mag with a shortish barrel close to 3000 fps with 300 gr KS. I'll have to check...

From a 6.5x68, it would be disappointing to have average velocities.

I want one. And have for thirty years.