4-Bore double rifle doubles

An old 4-Bore double rifle 'doubles' (both barrels fire at the same time due to the recoil from the first shot). Rifle is .960 cal (could be .94, or above the .96) with a 4 1/4' case and 2000gr lead bullet. (sorry the quality is so low, it was the only one available. Courtesy of gunshop.com)