The .38 Special can fire .38 Special, or .38 Long Colt. It
cannot fire the .38 S&W, which is fatter and shorter.
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38 special
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It depends on what you mean. A .38 revolver may be a .38
special, but there are other types of .38 besides just the special
round.
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.38 Special, .38 Long Colt, .38 Short Colt. .38 S&W CANNOT
be used in a .38 Special. .38 Special can be fired from a .357
Magnum weapon, but .357 Magnum cannot be fired from a .38 Special
weapon.