rgh, your gun has 2 3/4" chambers, which is why I think it was originally intended for export; most German 12s for domestic use in that period still had 65mm or 2 1/2" chambers. If it is still tight and on-face, regular US shells should be OK. I'd stick to the more moderate loads, since it isn't really good for waterfowling with steel. Mine patterns "heavy trap" 1 1/8 oz. loads very well for upland shooting; I use scatter load equivalents in the first barrel when hunting in tighter cover. Like many, mine is choked "full and fuller" and has 29+" barrels. Retailed in Salonika by an "armurie" with an Armenian name!
