I found this blank in a bulk lot of material last winter and cannot find a reference to it. The neck cannelure, paper wad and dark lacquer (shellac?) sealant certainly mimic the M1909 .30-06 blank, but nowhere can I find any indication we loaded these. Ball, dummy and proof, yes, but not a blank. Has anyone ever seen one before (I’ve not) or have any reference on it?
The primer looks much more recent than 1917, there is no primer sealant in evidence and there is a hint of resizing marks on the case (particularly a smoother “belt” of about .125" height just above the rim), but everything around the top of the neck looks “arsenal” to me.