Quote:
Originally Posted by colt_saa
Actually, this is a common misconception. The 40S&W is not the parent case of the 357SIG cartridge.
357SIG is a unique design.
Resizing a 40S&W to 357SIG will yield a case that is approximately .10" too short. It will function but you lose quite a bit of neck tension on the projectiles.
357SIG and 40S&W do share case head dimensions and overall length
|
I stand corrected.
Now that I think about it I believe it was based off of the 10mm Auto which the FBI initially tried but decided was too hot for their female and smaller framed male agents to handle effectively so they and S&W shortened the .10mm Auto case, reducing the powder capacity. If my recollection is correct that is how the .40s&w (Short & Week) was born.