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This ammo dump is meant to be used for a 357 or 38 ammo, but you could remove the metal inserts and carry other ammo. You can either wear it upside down, unsnap,and dump ammo into your hand, or you wear it right side up which is how it is intended to be worn, unsnap, and unfold either side of the pouch, then dump the ammo into your hand. I don't think these ammo dump cases have been around so much since most police officers are carrying 9mm and 45mm these days. I think it could be useful if you are doing any competition shooting.
I have several listings for police gear, so please check them out.