Fellow brought in to my friend's shop a Polish issued, Czechicon(?) mfg. 8xBIGmm caliber rifle to get sorted. Took a few quick pics, but I think I ought to ask permission to show them. Its 70"/1.78m OAL!

Does anyone have cartridge drawings, pics or specifications? Base is rather smaller than .50 BMG, probably about 0.640"/16.25mm
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