Bullet sorting before seating.

[Bobke]

I would check bullet base to ogive if you’re not buying substantial volume of same lot bullets. Have seen .020+ between different lot numbers of exact same bullet. Speaking Nosler, Hornady and Sierra mostly, less so with Lapua and not able to comment on Berger as no experience there. Within same lot, you may not be able the shoot the small variances, and time may be best spent behind the rifle or in load development at the bench, as noted above.