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Old December 1, 2012, 10:13 PM   #17
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Join Date: May 26, 2000
Location: Hastings, Nebrasksa - the Hear
Posts: 2,100
Three Five Seven, the answer is probably too simple...

The .357 SIG is a European designed round. Which means the designers think in millimeters, not caliber (hundredths).

For contrast, the .357-.44 Bain & Davis was a .44 Magnum case necked down to - no peeking - .357" diameter bullets.

SIG was already making .355"-.356" bore diameter barrels. Why bother with different barrel making equipment to cut a bore only .001" to .003" larger?
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