There is (or was) also the Eley Maximum for 2 1/2" chamber with 1 3/16oz shot load. This was my standard duck or goose shell for years until an old time gunsmith finally persuaded me that the "zx&*%%" thing was not built to use that load etc. Over the past few years I have never used anything other than Eley Impax 1oz loads for game shooting, irrespective of chamber length or proof load.