Regarding the lack of a seal, which actually was answered briefly but accurately, I received the following interesting
information from Col. Hackley. It is more an answer or addition to Guy's entry than anything I wrote, but I quote it
simply because it pertained to the this thread, and everything Col. Hackley has ever written to me was interesting and informative, as is this:
"John: The normal production method used at FA and the COCO plants was to apply the case mouth sealant
during priming which is still the case today at LCAAP. In yesteryear, the asphalt of lacquer-based sealant would not dry for about 72 hours depending upon the temp/humidity. So, you were committed to load the cases during that
period. Today water-based sealants are used and the drying time and delay to load is reduced. Calibration primer cases are primarily used for QC and malfunction investigation and are often provided to plants and contractors for
their loading and internal use. The cartons are marked "No waterproofing at Mouth" or "Without Mouth Waterproofing" because the cases may not be used for years and the waterproofing sealand would have dried and not serve its purpose. In addition, this allowed the user to either apply fresh mouth sealant or not as the test sample was being loaded for testing."
Regarding his answer, the part about "malfunction investigation" which I originally learned in discussion with friends from the Ordnance Company, U.S. Army Alaska, Ladd AFB, Alaska, during my tour there (I was in the Signal Company, but I was actually a personnel specialist at Command Headquarters and served the Ordnance Company and several other units, including my own, in that capacity), is what I alluded to about removing ammunition as the potential cause for weapon malfunction. At the time, on a tour of the shop, I probably saw some ammunition boxes marked "Reference" and didn't know what in heck they were, and asked. I don't recall - too long ago, but I remember learning about it, and many, many other things, from those guys. I didn't collect cartridges in those days, but already was a gun collector and have been a shooter since before high school.