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Glocks have a micro-groove barrel and I hate shooting lead bullets in them. I used to cast, and if I was going to shoot lead in one of my Glocks I'd buy an aftermarket barrel like a Lone Wolf that had regular lands and grooves.
I know. Some people are going to tell me they've been shooting lead bullets just fine in a stock Glock. It still isn't a good idea.
I would agree that shooting lead through your Glock polygonal barrel is not a good idea...IF you don't understand the mechanics of barrel leading and bullet obturation. I am one of those that exclusively shoots lead (almost half the cost of jacketed bullets...and I like to shoot a lot) through all my pistols including those with barrels having polygonal rifling (G19, H&K P30, P2000, and a Kahr K40). If you do choose to shoot lead, clean and inspect your barrels frequently as you develop your loads. If you want to learn the mechanics behind successfully shooting lead bullets, get a copy of Lyman's Cast Bullet Handbook...lots of info there you won't find anywhere else.
Glock and Kahr warn against using lead in their user manuals (not sure about H&K)...but then again, they warn against using reloads too.