Rich,
Yes, .481 nominal (+/- .005) just in front of the rim, drawing from Clymer. My Clymer .410 reamer cut the Beshi (ICD NID) barrels nicely and easily. It took all of a couple minutes a chamber.
I ordered my CSM .410 barrels full/full. Carol said she'd write it down on the order that way but couldn't guarantee it. I told her the tubes are likely full choked when assembled and probably aren't reamed to M/IC until later. Hell, I may just have them screwchoked on this gun anyway. It's not a collectable and even less so with these aftermarket barrels.
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