BTW, I also tested some of the Romanian light ball 150 gr.
The 'Case Hardening' is at the most.
In fact, Mauser 98 variants had been in production at Kragujevac on machinery purchased from FN for many years prior to 1948.
Picked up an unissued M48B a few years ago, cleaned the moving parts and barrel, and it is deadly accurate.
M48s are also often confused for the Yugoslavian M24-47 design, but the markings on the crests can be used to easily tell them apart.