Thanks for the positive comments gentlemen. I see that I made an error in my previous post, it's actually Todd281 who is making the larger cannon.
Anyway, to answer a couple of questions, I machined the barrel from a 300 series stainless steel and the breech band is 1018 that I heat shrunk onto the barrel. The handles are not TIG welded, but silver soldered. I originally intended to make the barrel from bronze, but after I found out how expensive that was going to be, I decided to use the SS I had on hand. Also, while I was doing research trying to figure out what I wanted to build, I ran across a very valuable document for anyone that is interested in making an accurate replica of one of the Civil War era cannons. Here's the link:
https://www.loc.gov/resource/rbc0001.2017gen19369A/?sp=11&r=-0.686,-0.032,2.372,1.508,0
Todd281- I'd really like to see photos of your cannon as you progress.
Ted