I have a 30" McGowan tube in 1:10" twist on my .308 BVSS. With my favorite load...I'm getting 2760 fps with a 185 gr. Berger VLD / Hunting bullet. I'd say the extra length works for my load...I'm right in the .30-06 ballpark but using less powder.
Can't speak directly to the 6mmBR....except it's the parent case for my 6mm Dasher. Even with fireforming rounds...it is extremely accurate and very easy to shoot i.e. low recoil.
Good Luck,
Wayne
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