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There are many possibilities for jamming. Where did the jam occur? Did it hang up in the mag rails? Half in the feed ramp? Hanging half out of the barrel? Cartridge nose against the front of the ramp? Is it just one mag doing it?

Can you get a picture of it jammed? The position of the cartridge when it jams can tell you a whole lot and it a good place to start...

Count me as one of the guys with many thousands (probably nearing 10k) of reloads through a 40 cal Glock without a problem. Then again, I find that starting loads cycle the action fine, maintain POI within reasonable distances (easily to 10 yards, who cares beyond that as this isn't a target pistol), and are easy on brass. Case bulge is negligible, barely measurable with calipers, and brass life is fine.

Loose chambered pistols (like Glock but certainly not limited to them) do not handle hotrodding as well as some others (like a full size 1911 built to 45 ACP dimensions and chambered for 9mm). Since the Glock 17 was built around the 9mm and overall dimensions left unchanged when they chambered it to 40S&W (making the G22), it left the safety margins reduced a bit. Add Federal trying to maximize case capacity and leaving the web of their cases thin, comp shooters trying to insure major power factors, careless reloaders trying for 10mm ballistics, etc., and you have a recipe for a higher than average failure rate.

Be careful and you'll be fine. Keep your barrel clean and even lead is fine...just clean often and watch for buildup...it comes on fast.