I’m shooting 12 gauge 3 inch 3x5 shot in a pattern master choke. Nice even pattern at 45 yards. Stones the ducks. Couldn’t get those shells this past year and was gonna get some 3 inch 4 shot but never had that either. You’ll want a full or improved modified choke more than likely.
I reload and it’s actually cheaper to buy BOSS shells than buy just the bismuth shot.
I did buy some 0 size shot and loaded it for geese and it’s a hammer.