Firstly, what are the dimensions? Is it a “Replica”(Fake) made directly from a 7,9mm case, retaining original dimensions, or is it a “swaged down” case, to the smaller .444 head diameter ( and turned down rim and new extractor groove)
The “extended Bullet” design is typical of the uncrimped RCBS 7,62x39 Forming set…also of the same type of 7,9x33 taper closure (still requries a card or wax wad).
Without dimensions to confirm a “Fake” or a proper Blank, I can’t make any further judgement.
BY the way, “oil injected” primer deactivation is NOT a safe means of deactivating Primers…they can (and often do) still ignite.
Only actually firing it,( Hot Plate) or soaking in warm vinegar,(24 hrs) will deactivate the priming composition.
Unreliable method of closing blanks, both for feeding problems in some guns, and also wads can fall out (and powder) under vibration of rapid fire.
Star crimp is the best way, followed by the taper to form up the point properly.
AV Ballistics Film Ordnance Services
AV Blankfire Pty.Ltd.