I am thinking way too big for a 22. Possibly a bullet but I see no resemblance of one. Maybe a musket ball with too much powder behind it? No clue here
Possibly native copper still in the matrix? Maybe nick it with a small file to see if there's copper color. I know there were copper mines in Virginia, but don't know if it came in that form or just as ore.
I think it's simply an iron or pyrite concretion that's weathered out. That flower like object grows inside a softer material, sandstone, limestone etc and over eons, the softer material is eroded away.
Don't believe it's man made.