Agree that reloading is best way to obtain low pressure shells, especially with current spotty availability from RST and others. I reload for my 2.5-inch chambered 20 gauge using WSF and Longshot, straight wall hulls (Cheddite, Fiocchi, Rio, Federal), and roll crimp them. Roll crimping, although not as necessary for your 2.75-inch chambered gun, is still a way to get around buying a press. I had some loads tested by Precision reloading last year using the aforementioned powders and both 3/4- and 7/8-ounce loads. I tried to post the results here a few months ago but couldn't manage to manipulate the PDF files into a form which was accessible here. I would be happy to forward the results to your email if you want to PM me with it.