9mm same size as 38 and 357???
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Thread: 9mm same size as 38 and 357???

  1. #11
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    The reason the .38 Special is call a 38 is because the original loading was the same style as the .22 caliber round with the exposed portion of the projectile being the same diameter as the brass case and the base of the projectile being of a reduced diameter to fit into the shell. I believe that the .22 cartridge is the only modern round to retain this feature.
    Curt360 likes this.

  2. #12
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    Quote Originally Posted by Sportymonk View Post
    "Despite its name, the caliber of the .38 Special cartridge is actually .357 inches (36 caliber/9.07 mm), with the ".38" referring to the approximate diameter of the loaded brass case."
    That's not right. The first ".38" cartridges actually used a .38 inch bullet of a "heel" type where the bullet diameter was the same as the outside diameter of the cartridge case and had a reduced diameter "heel" that fit inside the case. You still see this type of bullet in .22lr rounds.

    Later, the bullet was redesigned to fit completely within the cartridge case by eliminating the heel and reducing the bullet diameter to match. That's why current ".38" rounds use a .357" bullet but the 38 name persists.

    The same history applies as to why .44 rounds use a .429" bullet.
    sdismukes and Curt360 like this.

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