What is difference between a 38 caliber bullet and a 9mm bullet?

Not much The diameter of a .38 special bullet is 0.358 inch, which is 9.09 mm ALOT. The diameter isn't the only thing to consider. Although the calibers are close the 9mm and 38 special are no where near each other.

A 9mm is usually 9 x 19mm and is 115-124 grains and a 38 special is approx. 9.07 x 39mm near 160 grains and obviously packs more of a punch. Fire a 9mm and then a 38 special and it will make sense.

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