My local gun shop has multiple cases of 2 1/2” 12 shells right now. He was buying what he could to sell and came across a large number of 2 1/2” shells being imported from Spain I think. I have not seen a new factory short ten in 50 years I bet. There are some still around but not many. Most short ten users cut down those Roman candles and load their own. Most I know limit it to 1 1/8 or 1 1/4 ounce loads. At one time a short ten was a well thought of long range duck gun on the Eastern Shore. My grandfather had one which he used for all his ducks and geese hunting.