Oh, boy.
Victor, actually, the .38 Special bullet is .357.
If I remember correctly, and you should check this, the .38 Special originally came out with a heel-based bullet (the bullet was the same diameter as the case--like the .22LR), so the bullet diameter was actually in the neighborhood of .38 of an inch.
Later on, Smith and Wesson changed the round from a .38 heel-based bullet, to a .357 standard-type, but didn't change the name.
Do check my facts, though.
LawDog