I reload for my GLOCK 23 and 27. I use brass I have fired and other range pick ups. I always inspect the brass carefully and discard any I have a doubt about. I never reload to max, usually starting loads or medium levels. I have had only one problem with both guns, some rounds loaded a little long. They did not want to feed from the magazine correctly.
I have around 2,000 rounds thru the 23 and 1,600 rounds thru the 27 with half of these being reloads.
Now these work in my guns and may not in yours, do not use reloading info from the internet!
Rainier or Magnus 165gr JHP's with any good small pistol primer, various brass and 7.3gr of Longshot powder.
I have had no problems other than a few that were too long overall, accurate and clean.