how many rounds before they become reliable???
Who knows? This is like asking, "my car doesn't run right. How many mile to I have to push it before it straightens out?"
This "shoot to break it in" business is bull, foisted on unsuspecting buyers by gun makers to explain away their lack of quality control and decent workmanship. Simply putting rounds through a gun won't necessarily correct a problem. It depends on what the problem is, and what's causing it. Rather then waste your money buying ammunition I would send - what is obviously a lemon - back to the maker and make them fix it. That's what a warrantee is for. If these companies had to fix their junk, and pay shipping costs both ways, things might change.
And yes, you have a right to be outraged…