In England in the 20s the standard cartridge for a 20 gauge 2-1/2" was 2-1/4 drams blackpowder and 3/4oz, 2-3/4" 2-3/4 drams blackpowder and 15/16oz, and 3" 3 drams blackpowder and 1oz. The nitro powder loads mostly ran 1/16oz of shot less. From page 208 and 209 of Burrard's VolumeIII.
I have a Purdey 20 gauge made in 1927 with factory original 2-3/4" chambers and proofed for 1oz that weighs 5-12oz. It also has sideclips and the hidden third bite.
Best,
Mike
Last edited by AmarilloMike; 07/29/11 08:50 PM. Reason: I added [i]"in the 20s"[/i]
