Interesting, I was looking over a 1945 edition of Stoeger Arms Shooter's Bible and the same information caught my eye just yesterday. In fact, I copied the chart and posted it as an FAQ, it also had sizes I didn't know about. I also learned about the physical size change from one size to the next; the number of shot per Oz for both chilled and soft shot, interesting data.
What I posted to FAQ had one size smaller than 12, "Dust". It also had four others, "T", "TT", "F" and "FF" which were new to me!
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