Any word on this stuff? Just got 40 rounds at a good price. Plan on putting it up against 168 sierra match king this weekend.

There is some rumbling that this stuff is under pressured and perhaps not "match" as we have come to know it. Anyone with experience? Shaking it makes a lot of loose material noise and the movement is significant enough to feel the thump as the material hits the ends of the round. Sierra match king, no noise. Significant?