7/8"X14 is the industry standard on anything your press will handle. The Lee pistol/revolver dies are great. You can sit a Pro Auto Disk powder measure atop the case mouth expansion die and charge the case on the same stroke. As for the value of loading 9mm, that's according to what your goals are? I load em'. I load everything I shoot.
I load for performance, not economy. If I could, I'd load for my .22 rimfires!
I load for performance, not economy. If I could, I'd load for my .22 rimfires!