The learned discussion on another thread got me to thinking whilst stranded in the Kansas City airport for several hours last night.
On the right is our old friend, the fired 3.3in bolt with a lead cup sabot. In D&G on page 140 this is described as having a lead band sabot based on some recoveries at Perryville. Appears we have two variations on a theme...
Indeed the shell on the left is the exact one on page 141, called a 3.4" "Burton" but we have learned better about the name. The size stands up though and it has a wood fuse adapter. It is associated with the 4pdr smoothbores the State of Virginia had rifled for use early in the war. It is a shell and it has a lead band sabot. As those guns were rifled in VA, presumably this shell was made there as well.
Could this be evidence of manufacture of very similar projectiles, but one in the North and the other in the South? Or is it something much more diabolical...