In pistol FMJ's are a little different than JHPs, the FMJ's have a "naked base" which is more compressible than the solid copper base of a JHP (reverse drawn jacket). This matters a lot more in rifle than pistol though.
This is from Hodgdon for 9x19, which I assume is what you meant by 9mm.
125 GR. SIE FMJ Winchester 231 .355" 1.090"
4.4 1009 24,600 CUP 4.8 1088 28,800 CUP
Hope it helps.