I know in my circle of shootin' folks we do not consider nor address a 3 inch shell as a magnum. we will say there are 2 3/4, 3 inch and 3 1/2inch magnums.
So if this is what you mean in the original post Than I think you have to know what remington calls the 3 1/2 inch capable gun model. I know with Mossberg the 500 series is NOT a magnum capable. You actually buy a different model... The 535 and 835 Ulti-mag are both 3 1/2 capable pump guns.
Brent
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