M95 bore (land dia.) is .315 and groove .329 so this seems to be a normal 8x50R barrel. 8x56R used the same barrel (rechambered) but all vintage M95 sporters I have seen here on the former Austro-Hungarian territory were chambered for the original 8x50R (a few were rebarreled to 7x57R in Ferlach). So I am rather confident that a chamber cast will confirm the 8x50R.

Cheers,
Jani