I am not sure but I don't think you can load lead bullets because Glock handguns have polygonal rifling, and fouling will be great causing accuracy to suffer. The warrantee will be void if Glock finds out you one uses handloads. Please check out my information I may be wrong. Good luck.
Every manual for every gun made today says the warranty is void if reloads are used in it. Some of my guns have never had a factory round fired in them.
Myth about glocks and lead has been around for a long time. If the lead bullet is cast hard,(like mine), leading is non-existent. I've shot thousands of lead 175 grain boolits through my Glock M-22 without leading.