Well, I have a number of fact based guesses...
In NRA's technical department cartridge collection and the accompanying database there were almost 2,000 distinct cartridges.
My Donnolly book of cartridge conversions lists probably better than 1,000 cartridges that can be made using other cartridges, pipe, etc.
There was also a book in NRA's technical library (I wish I had swiped it) that was simply a list of cartridges and their dimensions. The author had spent decades putting it together.
I seem to recall it was over 3,000 entries, but I may be wrong about that.
The problem is, there's way to put a meaningful number to it.
Every time I think I'm getting a handle on all of the different cartridges that are out there, I come across a dozen more I never knew existed.
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