As The Dark mentioned, the RfP requires the ability to retain the cases (i.e. non-ejection of the cases) but having the ability for rapid follow-up shots. A revolver is the simplest way to achieve that and also without having to remove your trigger hand from the weapon (e.g. bolt-action).
So rather than thinking of the weapon as a strange or long, tech path, it's actually an easier tech path given the requirements (aside from the special ammo it used).
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