A fairly respected guy over on AR says the gun actually has a bore diameter of 1.052" and is actually a 4 bore. The article says a TKO of 700. It comes out to a 3000 grain bullet at 1550 ft/sec for 16000 ft.lbs of energy. That is almost twice the energy of my Owen 4 bore loads and the guns weigh about the same. It sure doesn't look like that gun kicks much for that kind of load to me. Powder wise it would take about 20 drams to get that velocity. Maybe the clip showing them shooting the 2 bore is the 12 or 16 dram load??? Anybody know for sure?