Wow. That would still be a big gun to drag all over the place. I do recall that a rather large Mexican cannon was used or was set to be used at the Alamo ... but that may be Disney flight of fancy.
Please post a picture of your find, with something to help with the scale. You may have a historically significant hunk of iron on your hands. How would one go about tracing the manufacture of such a projectile?
I just measured it, and it would be closer to 12-13 inches if it was a whole cannon ball. The very center looked like lava rock full of bubbles from when it was cast, and it has since disappeared, but from what is now the center to the outer edge is over 5 inches.
What something that big is doing here got me stumped.
It was dug up in the early 60’s when they were paving a dirt road.
I couldn't carry all the pieces so I only got the biggest part. When I went back with the wagon to get the rest it was gone. The maintainer had rolled the dirt over to the side and I couldn't find it.
One of these days I'll get off my butt and take it to the local museum and see what they can tell me about it.