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Two distinct ammunition families are represented here: 30 mm VOG-17 and 40 mm VOG-25. They belong to different launcher-system architectures, so the full ammunition designation is more useful for identification than nominal calibre alone.

VOG-17 and VOG-25

VOG-17 belongs to the ammunition family associated with automatic grenade launchers, while VOG-25 belongs to under-barrel and related multi-shot grenade-launcher systems. They are separate launcher-ammunition families rather than calibre variants of the same round.

Why 40 mm is not a single standard

The designation 40 mm does not identify one universal grenade-launcher ammunition standard. Other 40 mm families, including 40×46 mm and 40×53 mm, belong to different launcher systems and ammunition architectures.

For that reason, a 40 mm requirement should be read together with the exact ammunition family and launcher-system context.