Do a search in this forum on Glocks & lead ammo and you'll find many threads on this subject. I have only shot about 200 rounds or so through my G21 (no issues) but that is hardly something to say "it is totally safe."
Colorado4wheel has most likely the best advise; "You won't know till try them in your barrel."
Let us know how it works for you.
"A man can never have too much red wine, too many books, or too much ammunition"