Hello Wiredducker, Buy a 10 gauge PARKER SXS with damascus barrels and shoot 12 gauge bismuth out of it by using GAUGEMATES. Gaugemates convert the chamber from 10 gauge to 12 gauge and the old Parker will shoot great for you. See the web site for gaugemates at ---
http://gaugemate.com/gms.htm --- Good Shooting To You, Jent
I have a Parker DH 10 gauge with F/F chokes and 32" damascus bbls that is great on geese. I load low pressure smokeless and black powder loads of 1 1/8oz Bismuth #2. I also have a 10 gauge browning light 10, a Benelli SBE, Rem. 870 etc. and the Parker 10 is balanced better and swings better than any of the others. If you don't mind loading your own shotshells it isn't that difficult to cut down plastic hulls to 2 7/8" and load with IMR 7625. This is one of Sherman Bells Recipies. I have not shot ducks with the Parker 12's yet but will be doing so this season. Wish I had some #6 or #4 bismuth.
KjD