the barrel length is very unusual but a 9,5x56 MS isnt easy to find here anymore. scope with claw mount is 100%political correct( same I have for my Mosin project)!
I think that the 9,5x56 was intended for the british market. Why? its the only .375 diameter nitro cartridge from continental europe. there are a lot of 9,5mm target rounds and also the 9,5x60R Mauser but after nitro powder hiting the gun shop the 9,5mm diameter was becoming obsolet. not in britain where the 375NE 2,5" is so close in power to the 375 2 1/4NE and also shoting the same bullet weight that I believe the mannlicher cartridge was developt as the rimless version.