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*the*12 pounder Napoleonic cannon. The powder burning is 2.5 pounds of black powder made up of 75% potassium nitrate, 15% softwood charcoal (carbon for our purposes), and 10% sulfur. The projectile will be a 12 pound iron sphere, with a diameter of 4.52 inches. The barrel will be 4.62 inches in diameter, and will be 66 inches long. For the surrounding atmosphere we can assume STP. Are there any other variables or aspects of the question I should mention?