Some guns are finicky like that, mine's not really - some reloaded ammo I bought had a nose dive or two, out of 500 rounds but hey, if you can do fine with the W.whitebox ammo, thats the cheapest stuff out there
actually come to think of it, I did have 3-4 failure to feed when I had 600 rounds of American Eagle.
try polishing your feed ramp, seemed to fix my problem.