Well, that’s obviously a very nice gun. It was made to be a game gun, not a heavy fowling piece. No fleur de lis steel shot proof mark, also Notice the 950 bar proof…..for duck loads, you’d want the barrels proofed just a bit higher, usually in the 1200 bar range. The 2 3/4” chambers will also limit what loads you can shoot out of your gun.
If you were planning on shooting steel, that really limits your options.
Non-tox like TM or Bismuth gives you a few options, just remember that larger shot rarely patterns well out of a 20 bore.
What kind of ducks? Teal, gadwall, woodies, Widgeon you should be fine if your in reasonable range and using a high quality, moderate velocity non-tox like Tm or bismuth.
Unless you had a spot where you can shoot big ducks within 15 to 20 yards, I’d probably hold off and use a different gun capable of using more efficient loads.
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