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Rio is one of the longer established names in cartridge manufacture, founded in 1896, and has established a long and successful history. Rio has become a part of the much larger Maxam parent company in recent years and joins several other companies such as Melior, GB and SAGA. Maxam also bought the oldest UK cartridge brand, Eley, a few years back.
Naturally, when a cartridge company becomes part of such a huge parent company, with the capacity to manufacture all of its own components, these will be the primary components used by all the companies within the Maxam family group.
Maxam was originally a supplier of explosive materials for industry, military and other specialist applications. Propellant powders for shotgun cartridges have become a significant part of this and the volumes Maxam can manufacture has led to their products being highly competitive in the world of propellant supply.
A brief look through a recent Maxam brochure shows 16 different powder grades for various shotgun applications; mostly
