You can cut the shells back. There are us that have to, as we shoot guns chambered in 2 inch or 2 1/2 inch shells. Problem is, finding loads. None of the loading manuals have any. They are all made for 2 3/4 and longer. Wads are made to use with 2 3/4 shells.
Another problem is repeating shotguns are made work with a certain length of shell. You go too short, and the shell won't feed. Aquila, in Mexico, makes short shells. 1 1/2" overall length. http://www.smokewagongear.com/p-119-...l-4b-shot.aspx
They were designed so cops could carry 15 rounds in a standard riot gun. When they came out with them, they said they would work in Remington and Mossberg pumps, but would not work in Winchester. They would not work in autoloaders, period. There was a lot of discussion, on various boards, when they came out, and it was a mix of, "Yea, they work great in my gun" and "Damn, they won't feed at all in my gun". So, I guess, with them, you pays your nickel and you takes your chance.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.