Lately I've been measuring each box to determine the range base of bullet to ogive, they all vary and I can honestly say out of 300 or so Hornady 130 ELD-M they have been much more consistent within each box than ANY Berger. No a knock on Berger, I've messaged them about the range and the response was that you need a laser to measure, not sure I buy that because if a metal ring can't measure how can your rifling tell the difference? Anyway Bergers have had a wider range than Horady's and Sierra has been most consistent.
My ranges are typically 0.002 with Sierra, little more with Hornady and Bergers have been 0.006 or 7. I'm sure some of that is my Caliper resolution and repeatability (Mitutoyo) and my ability to consistently apply the same amount of pressure.
0.01 seems like a lot, but I will say the reason I measure, is box to box can be huge, so I measure and adjust base of brass to ogive accordingly to the box average matching my previous loads. This has maintained accuracy where previously if I left the seating setting they would not.
If there is any chance those are different lot bullets that is likely the culprit.
