Well Doug, you've simply had different experiences than most of us. Somehow, I'm thinking that all of us--and, on this BB, we are pretty numerous--who have been shooting long shells in short chambers for a very long time, would have stopped long ago if we'd had the same problems you report. And if we heard of guys getting 20+ reloads out of short hulls, we might have switched anyhow.
I think you need to write a magazine article on your reloading techniques if you're consistently doing that well. I have a 3" 20ga in which I NEVER shoot 3" shells, but I sure as heck don't get 20 reloads out of my 2 3/4" shells, using the best target hulls out there. Nor do I do noticeably better than when shooting 2 3/4" hulls in 2 3/4" chambers, or in 2 1/2" chambers.
