There was an interesting article in Precision Shooting long ago which tested the concept of brass indexing. The conclusions I remember: if using tested, good lots, of Norma or Lapua there was not a lot of point to indexing. But if using run of the mill Remchester, indexing was a very useful aid to making the best of a bad lot. I did indexing of brass and indexing of cartridge in the chamber for a while but did not notice any difference (rifle was only good for 3/4 inch at 100 yds for 5 shots) and it was major labour, so used Norma instead. On another angle, a Wilson seating die helps to avoid extra run-out at the seating stage without having to use any brain power at all (and any neck tension variation is very obvious).
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