After seeing the new photos, which are shot from different angles than the first set of photos, I must re-appraise that civil war artillery projectile fragment.
In finder Smokeythecat's first description of it, he said "cannon ball ID needed" (ball means a sphere)... and it looks like part of a sphere in the first set of photos. So, because of those photos, and because he was looking at the fragment in real-life and said "ball," I identified the type of cannonball it would be from. But in his new photos, it looks like it might be part of a cylindrical-bodied artillery shell, instead of from a spherical one. If so, that would explain why he said it is "3 inches in diameter" -- and in a followup reply he said "The top however, shows no evidence of a hole for a fuse."
In the new photos, it does look like part of a cylindrical-bodied shell. If that is correct, the only civil war artillery shell it matches up with is a yankee 3"-caliber Dyer Case-Shot... and the fragment is one side of its round-bottomed lower end, which is missing its zinc cup-sabot. I'd like to see photos of the fragment after all of the rust-crust gets cleaned off of it.
Here are two photos showing a 3"-caliber Dyer which is missing it zinc cup-sabot, and another photo which shows a sawed-in-half one that is missing the right-side half of the zinc sabot. If Smokeythecat's shell fragment is indeed from a cylindrical-bodied shell, not a spherical (ball-shaped) one, this is the specific type of shell I believe his fragment came from.
I should also mention... in another follow-up reply, Smokeythecat said he found the fragment at a farm near the Brandy Station (Virginia) battlefield -- and 3" Dyer shells have been dug at the Brandy Station battlefield.
Smokeythecat, please clean the rust-crust off the fragment's exterior, either by tapping it off with a hammer, or by using Electrolysis... and then post some photos of it. If it is from a 3" Dyer shell, it will have the little "step-down" near its bottom end, as seen in the photos of 3" Dyer shells missing their zinc sabot, below.