This cartridge is listed as the 10.8mm Montenegrin No.4 Revolver in Erlmeier, Brandt as Ref. 157. From an earlier IAA Forum discussion however this cartridge has been identified as an early long cased, inside lubricated 44 Webley by UMC. It will be listed here for continuity, but the reference will be under IMPERIAL HANDGUN
10.8mm MONTENEGRIN No. 4