Hallowed out cannon ball?

[Ckgene]

Found in Northeast Colorado. Please give me your opinion

 

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[fyrffytr1]

I believe your item is either the top to an iron fence post, part of an iron bed headboard or something long those lines.

 

[Ckgene]

I measured the circumference it turned out to be 6 1/8 of an inch yesterday I also found more items near where I found original piece. Now what do you think

 

[TheCannonballGuy]

Ckgene, you asked for my analysis of your find, so here it is.
No, definitely not a cannonball -- for several reasons:
1- All cannonballs which were smaller than 3 inches in diameter were "Solid-Shot" -- meaning, not hollow, and therefore, non-explosive.
2a- The wall-thickness of your find is much thinner than any explosive cannonball's wall thickness.
2b- There was a 2.5"-diameter civil war Confederate hand-grenade (which isn't a cannon projectile), but the wall-thickness on your ball is too thin to be the grenade.
3- Your ball does not have the look of excavated iron. (Especially when compared with the obvious excavated iron in the other photo.) All explosive cannonballs were made of cast-iron. Does a magnet stick to the ruptured ball?