Unknown big bore


#1

Straight rimmed brass case
case length 193 mm
neck and base diameter 41 mm
Rim diameter 55 mm
very big primer hole : 14 mm
no hstp
You can notice the big rim diameter regarding the base diameter

any idea ?
thanks
JP


#2

Could it possibly be a 38.5x193 case (1.5" heavy Nordenfeldt)?