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Why are different shotgun cartridges all called JK6?

I have come across three shotgun cartridges, one being RC, that have a cartridge called JK6. Why the shared name?

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SHOTGUN CARTRIDGES
Mike George
Easy, JK6 isn?t actually the name of these cartridges but the propellant, instead.

This means any cartridge maker can stamp the name on a case if he chooses to fill it with that particular powder.

This particular propellant forms part of a range made by Bofors in Sweden.

Because of its burning characteristics it?s one that loaders like to use in heavier load cartridges for, say, high pheasants.