for 8.99 for a box of 50 I know they are steel cased but does my glock care?

Would these cheapo rounds be reliable enough to protect myself in the event of a zombie apocolypse?
Or should i just forget about it and still buy something a bit higher quality.
I plan on purchasing upto around a 1000 rounds. I figured I would make a rule to myself that everytime I buy some ammo for the firing range at bill's in CIrcle Pines I would buy a box to stock up..