90mm Canadian Cockerill round?

[Spaceinvader]

Got this a few weeks back, it closely resembles a British 90mm cockerill projectile but a different shape and construction. The grey section of the nose is steel, with the body and fins being aluminum. The only markings on it are "H P M4 3" and another "3" on the fins. Single copper drive band, and it has never been painted either.

Any ideas? From what I can find Canada did use a 90mm cockerill gun on an armoured vehicle/car but cannot find info on the web, only for British ammunition.