If you look at Hogdon site you can find several mild pressure loads. Some are listed for 2 3/4" hulls. Most of the time you need to add cards to take up unused space. Loading the same load in a 2 1/2" hull without the spacer is a reasonable solution. Paper hulls are easy to trim and "look right" in doubles. IMHO.
Federal Paper hull, Trim the hull if you must but use a over the shot barrier if you do not get perfect crimps. I use clear plastic film over the shot made from a zip lock bag and a regular six point crimp. It seals the crimp if you do not get complete closure in the center of the crimp. This load is directly from the Hogdgon data chart.
Federal Paper Hull
Lead Shot 12 1 oz. Clays Rem. 209P Rem. TGT 12 18.5 6,000 PSI 1180
