I have about 250 each 9mm range brass and the lengths are from .750 to .740. The Sammi say's .750 to -.010 so that is .750 to .740 right? I was wondering if I should even trim the cases of just load them as they are, just for target practice? I know that is would be better is they were all the same length as far as pressures go but these are only going to be loaded for target practice, should I trim them to keep the pressure in them all the same? I can't find anything in my books about trimming pistol cartridges except for the pressures so I need some help and what length should I trim them to? Should I trim them to .742 to keep them all the same? Need help??? Thanks