Hi Cat Whisperer, GSMNP = Great Smoky Mountains National Park. I am very new to cannons, just got my first one a couple of weeks ago. It is a golf ball scale Sea Coast 13" mortar made by a gentleman named Tom Peterson. Weighs 85 lbs but still Great fun- I'm currently trying different loads to see what works best for the little beast. If you will be in the area, drop me a line. I'd love to see what you use. Regards, Pete