I wonder how many they made of these
A lot. The 40mm Bofors loading mechanism could be picky and test and adjustment required cycling with dummy rounds like this. Note that the projectile is secured to the case by a metal rod, not just a crimp, to ensure that a projectile did not get stuck in the barrel during testing.
Thank you JohnS learnt something again I could not resist to grab that one
when I saw it,even normal I do not care much for the big items.