I must say that economy store bought ammo in an auto would give me the jitters. I see that Wally ammo fail in more instances. It's the reason I even reload 9mm.
It will make you look dumb at the range or dead in the street. If you care enough to send the very best, reload. I'm not suggesting burning hundreds of two bucks a round ammo during familiarization, but if you are doing reliability testing, you must use the complete package. Hornady among others sell component bullets affordable enough for lengthy evaluations without a factory sponsorship. I launch XTPs at everything I shoot with a pistol bullet.
Probably a good thing then that most people would recommend against using bargain ammo for defense.
As a note, I buy a ton of Federal Champion at Wally World. Although it is on the lighter side, I have never had an issue with it at the range.