So, here they are, Lee 1 oz. slugs sized to remove taper then put into a form and hot melt glue skirt added.
One other modification... I used a drift punch to peen over the edge of the drive key to give the hot melt glue something to grab. Hard to believe but I've had glue skirts separate from lee slugs by hand! I am surprised BigMrTong's 3D printed skirts stay on but so they do.
Pic:
Hah! There is a bit of a feathery edge on them that looks way worse in the pic that actual. I'll clean them up a bit before loading just to be sure but I doubt it will hurt anything as long as the base is solid and flat.
I'll be shooting these through the new to me Mossberg Slugster smoothbore.
Range report to follow.
Longbow