Help ID'ing Artillery Shell

[painter777]

Pile of round fence posts.
If my Father was still alive he'd have something carved/whittled up that would look good by the time I got home from work.
Years back he was visiting and mentioned going out in the canoe while we were at work.
He didn't notice the paddles in the cluttered boat shed.
When I got home he was out there paddling away. Down on the dock I helped tie him off.
He handed me a old true 1" x 8" piece of old barn oak he'd carved in to a paddle.
Had to laugh, but it's hanging on the wall all varnished up. Heavy as heck.