terc, the reason for that is when the 2 inch chambered guns were first to come onto the market the Proof House wasn't geared up for them and insisted on proofing them for the lightest 12 bore proof equivalent then available which was the same as the 2 1/2" proof test. The gun makers eventually had it sorted out and a special 2" proof test was adopted. If your gun has the 1 1/8th. ounce proof then it is an early 2" model. They were never intended for anything heavier than 7/8th. ounce loads.
Once saw in an old paperback book; it may have been a Guns Digest Annual, where the author went to the trouble of making up 1 1/8th. ounce loads based on 2 1/2" cartridges shortened down for a 2" chambered gun. I can remember thinking 'the fool'! Bet he got a good kicking. No, stick to light loads and enjoy the delights of these wonderful little guns. I doubt if any more will ever be made and if they were you would have to pay an arm and a leg for one. Lagopus.....
