I use the Classic Doubles shells from Cabelas in my Smith 12- it has 3" chambers, but not marked like yours, double triggers, auto ejectors and 32" Ventilated rib barrels. I only use the 2 and 3/4" loads- 1 and 1/8th oz. No. 4 (marked Hevi-Shot on head of shell) and they drop ducks and geese fine. I also use this Smith for Tower birds, fezzants at my local club in Grand Rapids, and pigeons at the Marion Club- when I can find them I use the older Federal Premium Copper Plated loads, again in 2 and 3/4" length only. Wish they were legal for waterfowl.
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