Help please, I am trying to identify a drilling rifle caliber. It is 44 caliber but I'm unsure of the cartridge. Shotgun is 16 ga.; it is a hammer gun. Only markings other than one proof mark is 5 letters under the rifle selector switch. first 2 are hard to make out. Last three appear to be GET. So it is _ _ G E T . I've exhausted my search capability. I tried the archieves here also. A .44-40 case fits it best but is way too short. The push through slug measured .431. Only thing I know of would be a 444 but i doubt an old european drilling would have such a caliber. I assume it is an older (not used in US) european cartridge. Any help is appreciated.