A bunch of good examples, 41AE is a prime one. Come and gone could be judged by whats on the covers of the Gun mags on the shelves or other ways, nothing cast in stone here. Point is stuff like 32h&r were even offered in some very popular guns (Ruger Single Six) and still couldn't make it. Probably no fault of any of these rounds except maybe bad timing or lack of different guns offered for a particular caliber.
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