I had the Repro with the CSM .410 barrels out for the Yuma openner on dove. The full/full choked barrels accounted for 10 whitewings in the morning and about 20 high flying (some really high) Eurasian collared dove in the afternoon.
I used 7 1/2 shot on the whitewings and some 6 shot 3" shells on the high flying Eurasians after noting that the 7 1/2s were not cutting it.
I think I'm really pleased with the gun as a .410. Although, I did find the chambers a little tight and the extractor rods could stand to be trimmed a bit to ensure the gun doesn't close on the rims. I'll get on that this week. I have a new reamer and I want to put long cones in this one too.