If the barrels were originally 30's, and two inches were cut off, you likely have .005 to .010 choke left in each. That plus full cup wads will still give you tight enough patterns, particularly for decoying ducks. If you find a set of #3 barrels, they will be heavy. If you fit #2 barrels, you will have an unsightly gap between the barrel breech and the frame breech balls. A set of #3 barrels could be hard to find. Most #2 barrels were 30's and less than that would be hard to find in a #2. You need in the 1 1/2's before you stand a good chance of finding a 28", and then you would have a significant gap, even assuming the slot and barrel lug fit.
Also, if you find post 1910 barrels, they will have the side grooved bolt plate which mates with the action bolt. Your pre 1910 D action won't have the right bolt unless it was sent back and modified. DelGrego has the right parts for that issue and will do a good job.
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