AMERC brass has earned a reputation as being lousy for a lot of different reasons including: 1) the flash holes are often off-center which can damage or break your decapping pin 2) the brass itself is brittle and frequently cracks when resized or flared, 3) the primer pockets are for the most part too loose for reliable priming. This is one of those things where you're best to trust the experience of others and throw this stuff away.
And just for thought, it says something about the quality of this brass that practically every reloader to ever touch this stuff has come to the same conclusions. I mean you'll find people debate and argue about virtually every other topic imaginable in the firearms community. Yet, there is almost universal agreement that this stuff is junk. Again, you're best to toss this stuff and move on.