High capacity magazine question

[sapper740]

Originally posted by sapper740
Like so:

Many years ago my Grandfather owned a Schnellfeurpistole but donated it to a museum as none of his grandchildren (me included) were grandfathered for Full Auto, so all I got was a lousy box of ammo!

the box reads:

Patronen No. 403 mit Theilmantelgeschossen fur die MAUSER SELBSTLADE-PISTOLE. Cal.7,63
Deutsche Waffen- und Munitionsfabriken
Karlsruhe