marine: I wouldn't continue to fire that rifle just yet. The Turkish Mauser bolt fit your WW1 rifle by chance, and may not have fit properly but enough to get by. As I understand it but don't quote me, Mauser Rifle bolts were fitted individually and to fit a new bolt with proper headspace the rear of the lugs need to be lapped until the bolt closes on a round. I would really refer your question about the 'fit' part to the gunnut69, the moderator of the Gunsmithing Forum for his input. I also believe that when refitted or retrofitted or rebuilt, the work was completed at the factory or armory level; the rifles were sent there. I firmly believe a gunsmith is needed to properly fit a Mauser bolt, to assure proper headspace and to positively identify the bore diameter.
Also, I wonder if there is a chance that the bore of the rifle is .318", not .323 as the the later rifles. You did not say what ammunition you fired. Just thinkin'............