Bill, a lot of us regularly shoot reasonably pressured 2 3/4" shells in our short chambered guns. There has been a lot of research into this and the consensus is that pressures do not rise significantly. It is interesting that well after 2 3/4" ammunition became standard we had many manufacturers continue to cut 2 5/8" chambers for their guns. I believe they felt if the hull opened partially into the forcing cone a better gas seal would be made. A couple years ago Sherman Bell wrote an article in the Double Gun Journal reporting test results of shooting the longer hulls in short chambers. He arrived at the same conclusion. The article is in Volume 12, Issue 4 (Winter 2001). They can be reached at 800-447-1658.
