As most of you know, the early UMC boxes had round corners instead of square as used by most other cartridges companies. I found a statement as to why in an old UMC catalog. The quiz question is “WHY”. There is no prize, just a “Test Your Knowledge” question. BTW, I have been collecting ammunition since 1958 and collected .22 boxes extensively from 1970-1990 and never knew this until I read it in this catalog a week ago.
The answer will be posted Monday, unless someone comes up with the correct answer.