60mm mortar test thing???

[Jawasinger]

Any one seen one of these before? Some sorta powder measurer???? pressure tester??? subcal??
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[ordman]

If I were to guess I say a sub-caliber device
along the same line as the 81mm
I would guess that a small caliber blank type round is
inserted into the base so that when the round is dropped down the tube
the percussion hammer fires it and that initiates a sub-caliber projectile what ever that may be.
I wonder if the round numbered thingamabob may be increment charge set