Bump to an old thread from a new guy who looked up this very subject. Being brand new to reloading (but a shooter for half century) as I'm putting together a kit I'm overwhelmed with info. The case length (as opposed to OAL) came up & since I spend an hour last night going through a box of once fired, cleaned & polished 9mm brass I just bought, to separate by headstock (1 group WIN, 1 group Blazer, 1 group FC, and 1 group everything else) I measured some at random from each of the three branded/separate groups. VERY few made it to .750, with most of them running around .742 +/-. Glad it's something I don't have to worry about, but I might buy a small bag of new brass tomorrow just to measure case length. Thanks!
