A used 12ga Mec single stage can be bought quite cheap. Then buy a " short kit " from Mec, or make your own. Then you can make about any low pressure/recoil load there is. It's fun shooting your own loads and the Mec with a short kit should be under $150. I've been reloading and shooting my old SxS's for about 20 years and have always used 2 3/4" shells, but I know they're all low pressure, so I don't worry about it. Good luck.