I have a small replica Coehorn mortar for sale. It is labeled "Barney's Cannons". I believe they turned into South Bend Replicas. It has a 2.25" bore and is about 9" long by 4" wide with a powder chamber cast into it. It made without a steel sleeve, but I used 70-90gr. of 2F(seemed like the 2F worked better than the 3F) and a 4oz. juice can full of cement with a metal loop to hold a streamer. 70gr. would send the cans farther than I wanted to walk to retrieve them. If desired the genuine "non-historically correct" plywood carriage with the custom made sledgehammer handle elevation device is included. Weighs about 25lbs. $200 plus shipping. It would need a wooden box to be shipped safely.