MFS 9mm brass - bad?
Recently I loaded 100 factory new MFS (hungarian) 9mm cases but had much problems with resizing. Although they were properly lubed with Dillon lube it was quite hard to push them in and pull them out of resizing die. Finally, when loaded, about 20 rounds were useless, cases were bulged at the bottom and didn't pass the chamber checker. I used Speer 130gr FMJ bullets. I'm reloading 9mm on friend's Dillon XL650 with Dillon dies and never had such problems although I pick & load almost every brass that could be found on range, after proper washing and tumbling, of course.
So, if you find some new cheap MFS 9mm brass be carefull, try at start some few before you buy a big bulk.
Better be judged by twelve than carried by six.