I have a overall bullet length gauge for all the Calibers i reload. From time to time I find a round that just will not chamber correctly. Consequently i got into the habitat of using a Case length gauge two ways. I can check a loaded round and if it fits it will fire, any thing that does not is a reject. After pulling the bullets and seating the case in the OAL gauge backwards as if it was a trim die i find some are stretched and to be discarded. The 9mm is not a true straight wall, so can not put in backwards. Still can just put in without the bullet to test.
Or I have the choice to check all for stretched cases before I reload.
Some are happy to just use the pistol chamber and use the old timer eyeball and finger test. Sure they are doing what works for them.