I have a Bronze cannon barrel which is 8" long and has an 1/2" bore. I am building a naval style carraige for the barrel, and I intend to mount it on the fore deck of my steam launch. It will fire black powder only and will be used only for show and sound. With all the different types of powder and grain sizes, etc.out there, what would be the best one to use? I am probably looking at 1 pound quatities. Also, what would be the recommended size of charge for this small cannon? Thanking you in advance, Steamerdon