interesting double rifle but I doubt that this a 10,75x52R. it looks much to early for this round. I search a little bit about this cartridge and have a sporting rifle projekt with a Mannlicher M 95 action. a new chamber reamer will be made this year when my die set arive from ch4d.
I dont see a neck in your pic but it could probably be the 11,2x52R kropatchek or the 11,5x60R 450.
waiting to hear the dimensions from a chamber cast.

Last edited by pwm; 06/14/11 10:39 PM.