I owned a 2” several years ago. The loads it used generated a lot more than 1,305psi. More along 8,400psi. One factory shell I could get were Lavale I think and they were really unpleasant to shoot. About as unpleasant as shooting a 3” 20. 2” 12 were struck light to really be a 20 gauge type feeling gun. You ended up with a 5 pound gun with IM chokes in both barrels. I tried a 15/16 load which patterned very poorly. My best load was a 7/8 ounce load and one Federal paper cutdown load which was 13/16 ounce.

I moved on from it because it did nothing a good 20 could not do much better and the 20 could handle a full ounce where the 2” 12 could not. Or at least mine patterned poorly with anything above 7/8 ounce. I was told one maker made just about all the 2” guns no matter what was engraved on them. For those who own and love them you don’t have to worry about my bidding against you for one. Enjoy them in peace.