I've shot them through the Metro barrels. They were the brain child of L.P. Brezny, back when he lived in the Twin Cities. He hunted waterfowl a lot in places where it was perfectly legal, but often complaints from neighbors would result in game wardens or cops showing up. So he was looking for a way to shoot quietly without the hassle. This is the result that Federal (and Hastings, although I believe the barrels were actually made by Verney-Carron) came up with.
Federal invited a bunch of outdoor writers for a tour of their facility. We had a chance to try the long barrels and quiet loads. And they really ARE quiet, through those long barrels. I could hit targets that didn't require much lead (straightaway or minimal angle) relatively well. Anything with swing involved, it felt awkward as hell.
