i don't know the answer. You indeed have 2-3/4 inchers, but I do not know if that model or your barrel is rated for a magnum load. This reminds me of when I was sold magnums for a 12 gauge manufactured in 1908 and I showed the idiot at the gun store the old single shot. I knew nothing about shotguns, then and, fortunately, I never shot it. I would not shoot them in your's until you have the answer.
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