Rolf, thank you for the info! I am planning to hunt a buff with my 10.75x68, and once I manage to find a dieset, will start reloading and develop loads! Just a note on chronographs.... we tested the old Chrony one's with a new Garmin, and got very interesting results! Because the Garmin is right next to the barrel and the old Chrony is 5m in front of the barrel, the results that the Garmin give is always faster than with the chrony! I friend then respond that by the time the bullet reach the Chrony after 5m, the velocity could have dropped by up to 30-50f/s?? That was about the difference that we measured. Just a footnote.
I shot a few rounds in my new custom build 10.75x68 and the old Kynoch's 347gr measured between 2100-2150f/s with the Garmin and the Chrony. There was not really a difference between solids and softs.
So with the right powder and primer combo, I think 2100 would be easy to reach with 400gr?? I will let you guys know!
See below photos of my new 10.75x68 build on a DWM action.