Not to hijack the thread.
Yes , the 10,75x68 Commercial Oberndorf actions are perfectly tailored for the 9,3x64 Brenneke.
Bolt head , magazine box , feeding flawless without any alteration.

Maybe that I get lapidated by the purists and the aficionados of the historic - in my eyes somewhat anemic - 10,75 , but in 1999 I had that Type A Double square bridge 10,75 rebarrelled to 9,3x64 .
One of the most versatile all around cartridge for african use.

Third from top

Miles away from the perfect and flawless execution of the Dorleac creation I should ad.