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Quality Brass is one of the top three criterea for extreme accuracy. The others are barrels and bullets.
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I always understood the " 3 B's" of accuracy to be bullets, bedding and barrels.
However, I agree with Bounty Hunter anyway. I only use high quality brass when available. Messing around with Rem, Hornady or other general production brass just isn't worth the time and effort to me. It also produced groups that were measurably larger in my custom rifles
. The Win 284 brass seems to be the exception and some top 1,000yd competitors have used this brass to take home the trophys.
This may all be moot in a "hunting rifle". For 99% of the hunters it really doesn't matter if Lapua or Norma brass would reduce their group size by 10%. [img]/ubbthreads/images/graemlins/smirk.gif[/img]
To answer your initial question - Yes, I do consider which cartridges will have quality brass available for them when making a decision on what chambering I want in a new barrel.