g17 will lead up fast and maybe suffer high pressure if not kept lead free. i would suggest change your lube and buy some bronze wool and some dowling. Scrub the bore with the wool to remove the lead. A high pressure lube is needed for 9mm, correct boolit size (about 1thou over bore size)Glocks have a sharp lead which can also create leading. Shooting lead in any 9mm can be a matter of trial and error.
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