I was basing my comments on extrapolations from research and actual measurements I did on .45 ACP cases. The difference may have come about for three possible reasons: 1) Being European in origin the 9mm cartridge family adheres more closely to actual caliber name dimensions. 2) Smith may add a plus (+) side to their chamber dimensions based on specified length. Or, 3) I'm flat out wrong.

I am still of the opinion that Smith didn't intentionally set out to have the 986 and 929 chamber 9x21mm rounds, but it was just incidental to good manufacturing practices (+ and - specs).

Adios,

Pizza Bob

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