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IIRC, rubber "bullets" are somewhere around 30mm, which isn't that far off from the size of the rounds grenade launchers commonly use - I think those are usually 30-40mm. I saw somebody recently say that they're the size of 8 or even 4-gauge shotgun slugs, and an 8-gauge is 25% larger than a 12-gauge.

They're also not rubber like people think of when they hear the name. They're a metal slug wrapped in a layer of rubber or foam.

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