Gentlemen:
My Rasch combination gun (Büchsflinte) from the 1920s is chambered for .25-35 Winchester (besides 16g), which in Europe is usualy named 6,5x52R. But this one is marked 6,2mm/52 on the barrel flat. Why is that? My guess is this is land diameter of the rifled bore, or maybe bore diameter before rifling, but would need a confirmation. The reason is I have trouble registering this gun as the caliber on invoice (6,5mm) is different from the marking on the barrel flat (6,2mm).
With kind regards,
Jani