With those kind of variations,your best to sort them into groups by length.I've run into that with Nosler seconds,being as much as .010 difference.The good thing it was only from one lot to the next,but I did have to change my seating depth to compensate for it.I'm sure the reason for it is machine setup.Sounds to me like your bullets may have been a mixture of bullets from several machines.Variations in lengths are one reason I have no desire to load into or very close to the lands.It can get you into some pressure problems real quick,especially if your running close to max.I usually start at .030 off the lands and work back from there.Really the best answer to your problem is contact Sierra,be nice,not an ass,explain to them what you found and they will most likely make it right.
