Re: 6BR twist rates?
Over a dozen of the guys I shoot with have 6BR's, I have a 6AR. They are hard core bench rest shooters and any group larger than a bughole is cause for wrist cutting. All of the have 1:8 twist and shoot the light bullets as well as the 107's. Both light and heavy bullets win matches. Just about all use Krieger barrels, Lapua brass, CCI Match primers, Vitavouri powder, most, but not all use Bergers..I personally use an AR with a Whitely 6mmAR that is a necked down 6.5 Grendle. 1:8 twist and shoots 87-107's into .25". I'm partial to 107's for the same reason Broz is.
"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt