Well it should also shoot .380 also. After all a 380 is also a 9mm
rounding errors from millimeters to "caliber"
.001" variance, lots of folks lose sleep on "slugging" revolver barrels to find the exact fit of lead bullets and neglect the human facor in shooting. Then there is all the issue of "leading"? lead hardness vs velocity
Essentially they are the same give or take .001" or 0.0254mm!!