I need some help! After shooting both my reloads and factory loads I found that my reloads (38sp, 9mm & 45) fired inconsistently when compared to factory loads.

I use the same powder, same primers, same bullets (caliber specific), same dies, loader, etc. The only thing that may differ is the individual crimps (done manually due to various cartridge lengths). Any idea what my problem may be? Any help would be appreciated.