THERE IS A GREAT ARTICLE BY SHERMAN BELL "LONG SHELLS IN SHORT
CHAMBERS" IN THE WINTER 2001 DGJ THAT WILL ANSWER A LOT OF THE WORRIES ABOUT SHOOTING 2 3/4 " AMMO IN SHORT CHAMBERS. IT IS LONG AND COMPLETE WITH EXCELLENT DATA.
THE RESULTS ARE THAT IT INCREASES PSI A FEW HUNDRED LBS, GENERALLY IN THE 500-600PSI RANGE EVEN WITH FEDERAL PAPERS.