The OAL will depend on three factors: the barrel in your Glock 23,the actual bullet itself, and the magazines. Just going to have to use trial and error to find the best OAL for your pistol. You want the cartridge to drop in your barrel freely, move around freely while in the chamber, and drop freely. The barrel is your ultimate case gauge. Load it as long as possible. As far as primers are concerned any small pistol primer will work. If you need to go cheap try Wolf. I use Federal almost exclusively.