One thing I have learned "patterning" my 20 ga repro on ducks is that using the 28" M/F barrels is rather destructive over decoys. I shoot it well and will probably use the 26" IC/M from now on. I have used my 28 ga repro on ducks with the 28" M/F barrels with far less damage probably due to skimpier load. I especially do not recommend 3" 20 ga. loads, bismuth or otherwise, on ducks over decoys with M/F barrels unless duck burger is the objective. I tried it a few times with those very results.
I will be curious to see more scientific results you come up with.
-plc-
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