Curious question about bullet lot changes

[regency]

I was just curious to ask you guys what you notice on lot changes amongst bullet manufactures. I have found that as long as I seat the new lot at the same o-give distance to the lands, I really don't see a change in SD/ES or 100yd groupings. This is my experience with Hornady and Berger so far...

What is your experience?

 

[Olen_4504]

a buddy of mine had a lot of 105 hybrids that were 0.040" longer than his previous lot.

he didn't see any difference in performance until he got out to 900+ yards. the vertical spread was significantly different at distance. enough to miss.

i think he ended up tweaking his BC for that lot

 

[A&8's]

I buy my 140 ELDm's in 2K boxes. The last box I got I noticed they were .025" longer from base to ogive. I kept my jump the same and didn't notice any velocity or data change out to 1200y.

 

[straightshooter1]

In receiving a different lot of 175 gr SMK's, I found there to be a difference of .035 in the bearing surface length (most of that difference was in base to ojive) and did an experiment to see what difference it might make. I found that there was a significant difference is seating depth, which affected average velocity and also due to that difference showed up on paper as a small shift in POI at 100 yds.