Attention to shotshells collectors

I am pretty close to finish my book on shotshells showing the different existing calibers (Rim Fire, Pin Fire, Center Fire).

I do not want to forget to describe some rounds.

So please, if you have a shotshell you think the GAUGE is rare, just send me an E mail telling me what you have.
Only gauges, not shotshells loadings!

For exemple a scarce 12 gauge with tracer shot doesn’t interesting me, but a stange caliber like 11B or 18 Pin Fire it is OK.
(I have already listed these last two ones, it was just an example).

Strong canons, anti hail, punt gun shells are the most desirable.