The colours of the bottom and middle match Hispano-Suiza ammunition.
Silver projectile body = practice
Silver projectile body + red above driving band = practice tracer
As to the top one, that's not in the document I have (DIA Small Caliber Ammunition Guide Vol II - Calibres 20 to 40 mm).
The silver and red would suggest it's some form of practice-tracer, but it's not clear what the blue tip means. They made a practice spotter-tracer, but that would have an orange-brown body.
Are there any codes, other than can be seen, on the projectiles?
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