I've had them in several gauges, and figured they must have been a teaching aid, or a gunsmith might use them for checking chamber and rim depth. I never figured them to be a snap cap because of the lack of some sort of resistance for the firing pin (or hammer, in the case of a Parker) to strike.
I also have thought they were a statement about my not knowing exactly what they were used for. Yes, that's probably what it means.
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