• All the SAAMI specs are online....
HERE.
• That Min/Max number is really the number for
newly manufactured brass to properly fit the chambers of all 9mm guns in the US. For reloading purposes it can even be a little shorter, but when you get shorter than 0.744" the case is suspended more by the extractor than by the end of the chamber. Not an optimal condition, but it still works.
There's a theory/ conversation/ general belief that handgun brass gets shorter over it's life. If so, I must have some of the shortest brass in recorded human history. All my brass goes from my home range, back to my reloading cave, then back to my range. I don't have a piece that's not 15 years old, a lot of it nearing 25. But, case length measurement has never been one of my reloading criteria.
So you can measure your brass length if you want, but I wouldn't be throwing away any brass because it was, for instance 0.742". Length is simply not one of the
major reloading criteria. Throw it out if it splits or cracks. Throw it out if you can push a primer out with a wooden toothpick. Otherwise, reload it one more time.
