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Yup, the 590 was designed to fire slugs. I had this same question when i got my 590 so I called Mossberg and was told it'd fire ALL the factory loads. The 500 can't fire 3" magnum but according to Mossberg the 590 can, what they told me over the phone.
What? I shoot 3" all the time in my 500 and my Maverick 88. Cant shoot 3.5s but 3" is perfectly fine.
So whats the magnum mean ?