The round, heavy item in question was found on private property in San Antonio Texas, about a mile as the crow flies from The Alamo. It was found on the ground, after a rainstorm.
Now I know some cannonballs were filled with explosives, so as a precaution, we've taken special care so as to not drop it.
Could it be a cannonball? You can tell where it was cast and the sides were ground down to a ball shape.
It does indeed look very much like a 19th century cannonball, although identification would be much easier if you posted some measurments. What diameter is the ball, and how much does it weigh? Also, it looks like an iron ball in the photos, but looks can be deceiving. Do you know what it is made of?
I'm not overly familiar with early modern shells, but if the ball was indeed an artillery shell filled with powder or similar, it should also have a small opening or groove into which a fuse could be inserted. It would of course be possible to seal such a fuse hole with iron or similar, but I've never heard of such a thing and I cannot think of a reason why anyone would do that. Knowing the weight and material of which the ball is made would also give an indication of whether the ball is hollow or not.
