Quote Originally Posted by ccdjg View Post
Yes it is, more or less, but still a weird calibre for a pistol. Any lead pellets or conventional darts in that calibre would struggle to reach the target. You can get softair plastic ammo in both of those calibres though.

Not really a weird calibre for a German pre war home market gun. RWS listed pellets in 6mm, 6.2mm, 6.33mm and 6.5mm during that period. might seem strange to us but there was not a lot of standardisation amongst the continental manufacturers at that time. I have seen adverts for darts in all those sizes and even as large as 7mm

Have a look at Smiths book pages 102 -104