Rolf, thank you for your info on the cartridge and the bullet and powder choices!
do you know maybe what velocity did you get with 400gr bullets?
I am still looking for a dieset in 10.75x68 so that I can start with load testing and development!! So if any of you gents know of a dieset somewhere, please let me know! I tried CH4D in US, but they dont have stock at moment, and they cannot tell me when one will be available! I have bertram brass and an assortment of bullets, so very keen to start reloading...
I will post my custom new rifle's photos tonight!