Something extra sure is used. If you look at the graph that was posted,Primer manufacturers say it takes more labor to obtain the consistency in the BR series. More labor => more cost.
There is 3 columns that are close. Another sample from the Federal
Champions has much shorter columns with a much wider spread.
The BR2's with a sample of 300 has nine columns. The Federals with
only a sample of 50 would have 13 columns. With this particular lot of
Federal Champions, It could possibly drive someone nuts trying to tune,
let alone trying to run a tuner test if not sorted.
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