I have a number of these 20-gauge “semi-caseless” shotshells that have accumulated over the years. One is marked “WRA Exp” in in on the side, but I haven’t been able to find any more information on them. Most have a disk of lime-green compressed powder with silver priming composition in the base. Unfortunately they’re proving difficult to get good photos of, but here’s one:
The color of the powder composition makes me think it is not WRA, but S&W or even Italian. That’s a SWAG (scientific wild-ass guess) on my part.
Anyone know any more? I’ll try to get some better photos later.