Coincidentally, this forum seems appropriate for to share what I did with "old" shotgun shells this evening.
I have a box of 25 Winchester 12-Ga Paper shells that were handloaded by a deceased friend, but the box has no information regarding what's in them, so I figured I'd just disassemble them. There was nothing spectacular about the contents, just a red pc wad, powder and shot.
What WAS interesting was a box of Remington paper shells in a "Kleanbore" box. All of them were paper cases but one was ribbed and looked like it had a plastic case. Opening it up,I found it might have had a very thin plastic cover, but it was definitely all paper underneath.
I discovered a way to open them that is immensely easier than sawing off the top. I used a standard electrical wire cutter (used for gauges 14-18 and smaller) to clip the lip of the crimp in a circular fashion while keeping one other finger on the top. Gently prying the top off with a needlenose pliers allowed me to dump the shot much more quickly than sawing the hull.
The "Kleanbore" shells were 20Ga, with "Scatterload" stamped on a few, while others just said "Kleanbore." All identified the load on a small disc covering the shot at the crimp. The cases are low brass, with "UMC-Remington" scrolled around the brass base.
The disc states they are 2-1/4 dr equiv, #8 shot, 7/8-oz load. I tried to fire one off but absolutely nothing happened, hence my decision to dismantle them.
The "Scatterload" revealed 117gr of shot under the crimp, over a paper wad about 0.04"
thick. Following that was 125gr of shot over another 0.04" thick wad and finally 125gr of shot, for a total of 369gr - a bit shy of 7/8-oz but I may have lost some in dumping.
Then came 2 paper wads, each about 0.18" thick and a third wad about 0.11" thick, then the powder, which I forgot to weigh. The primer looked corroded even though everything inside was dry as a bone. The initial shot was shiny but as I got to the last 25% the shot had a dull gray appearance. I actually had the impression the shot was 3 different sizes but it measured about 0.08" in diameter.
The "plastic" covered Kleanbore round was also identified by a small paper disc at the crimp which said 2-1/4 dr equiv, 7/8-oz and #8 shot.
Removing the crimp as I did above, the first thing different was the entire load of shot was there -weighed 388gr, a few shots more than 382.7gr for 7/8-oz. Under the shot was 2 wads each measuring 0.25", followed by 3 over the powder paper discs totaling 0.14" thick. The powder weighed 16.6gr and again, the primer looked corroded.
Everything was dry and easily and smoothly removed.
What a difference from today's simple plastic AA hull, a plastic wad holding the shot over the powder charge!!