It has to do with the rifling in glocks, it fouls the bore more severely. It won't hurt the gun, but accuracy will suffer (pretty badly from what I understand). I would shoot jacketed bullets preferably.
Exactly, get a true land and groove rifled barrel. Then you can shoot lead. Always make sure you keep your pistol cean too. I have shot reloads for years and had very little issue. Funny thing is the dangerous part is accidentally making a squib. (not enough or no primer) The pistol goes bang but feels funny. Disassemble the pistol and there is a bullet stuck in the barrel! If you do your normal tap, rack and asses... boom goes the pistola. So just be mindful. Reloading allows me to shoot as much as I want. Plus, you have great control of the rounds you make. (hot, mild, etc) Here's a photo of a squib. Only happened once!
I cant get another barrel its illegal in south africa if my gun blows a barrel and i replace it i have to re apply for a license witch takes about 3 months to a year thats if they grant it the first time still waiting for my license as we speak but luck the gun shop were my gun is at has an indoor range