If you have the Berger manual reread the section on seating bullets. IIRC they state to start at 0 and move back in 0.030 increments out to as much as 0.120, and when you find a depth that is showing promise work in and out from there in small increments.
Personally I would try the Sierra before I went through the expense of the Berger's, I use Berger only in my 6BR, Sierra's in everything else.
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