lbmii,
I tested 9mm, that's how!
Your SD is pretty good, did you fire for accuracy?
denfoote,
I don't buy factory very much, but I expect a certain level of quality control from ammo. Shooting the Winchester bulk pack I was constantly in fear that one of the underpowered rounds would result in a stuck bullet. I suspect the bulk packs are ammo that is just barely within spec on either end of the spectrum. That why some boxes produce only high velocity, some low, some both.
There shouldn't be second quality ammo, the risk is too great. Some things just need to be done right.
David