But for practice, who cares if it is cheap enough?It's ammo that didn't pass inspection specifications for any number of reasons. Easier to sell as "seconds" than to take apart and try and load again, or just throw out.
Expect bullets with weight that vary from specification, powder loads above or under specification, blemishes on the visible parts of cases and bullets, and possible errors in the depth of primers.
For example. 115gn bullets that actually weigh 113gn or 117 gn...