It’s more interesting and educational when you can pull out rare stuff none of us have!
I bet No1 has interesting and rare stuff none of us have. 
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Yeah I reckon we’ll have to start wildcating our own rounds to stump him too 
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Cheers mate.
OK, 1Fatmans cartridge is the 30 Borchardt, Designed by German born American Hugo Borchardt, aka 7.65x25mm. Here’s mine, 
410 shottie with slugs? In some brass case
No, std factory cartridge of it’s type
Is it an 8mm?
No, but not far away.
closer to a .357?
Other way, bigger than 8mm
What about a 32 S&W?
No, but probably equally as old.
Is it a 320 Revolver?
Sorry, seem to have mucked up my reply before, meant not closer to 357, but bigger than that, over 9mm.
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So something like a 38-40?
Similar but shorter, much less powerful. 1st clue, the number stamped in the projectile is year of manufacture.
Is it a centrefire or rim fire?
Centrefire, it is the last iteration of a series of cartridges for it’s revolver, starting in the 1870’s. here is the “family”,
,
10.6x25mmR German ?