un show reloads, unless you're buying from a known reloader with a good reputation is arguably a form of "Russian Roulette."
One guy I know had a Glock 19 blow up in his hand from gun show reloads.
If youy want to shoot a cheaper alternative, check out Georgia Arms (on the web), which offers high-quality reloads and new ammo as good as anything you can get anywhere.
Blazer can cause some extraction problems in CZs, as can Winchester White Box in the value pack. A crappy extractor spring can make things worse, too.
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Avoid the gun show reloads... its not worth the risk.