I have an Ortgies .25 pocket pistol manufactured by "DEUTSCHE WERKE, WERK ERFURT". It's in very good condition however it just isn't firing properly. We have tried a couple of ammunition variations but to no avail. What happens is that the round will chamber properly, but not fire. After the round is ejected, inspection reveals that there is a fairly good strike mark on the shell, but no bang. Does anyone have a .25 cal Ortgies? If so, what kind of ammo are you firing and is the gun finicky?