I'm not too familiar with .40cal loads, but what I do know, is DO NOT handload hot cartridges yourself...
I've read, a lot, but on the internet, that the .40 case is already borderline as far as safe case pressure goes, and I know nothing about your Glock 23, but you may wanna investigate just how much the chamber is supported in your pistol, as it may go boom...
again, I'm not terribly familiar with the .40, or Glocks, but I've read the same thing a few times, so its possible theres some truth to it, and I'd feel like an ass if your gun blew up in your face and I did'nt mention this...
hopefully someone more knowledgeable about glocks and the .40 will pipe up and either validate my points, or call me a useless son of a bitch