I thought most modern calibers came after the 30/06 named because it was 30cal designed in 1906... 30/06. The 308 was a shortened version of the 30/06 I cannot remeber how the 08 came into it but I thaught it was a measurement thing. Most names came from the designers/wildcatters looking for a catchy name and have little to do with exact bore size. This was my understanding which may be partly right or not at all. Wheres flintlock when you need him.
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