Hi all,  I have just bought a gain twist Bartlein 6mm barrel  - 1 in 8.5 to 1 in 8 which is going to be chambered for 6BR.     Does anyone actually know if a gain twist barrel has anything over a normal twist barrel?   (Going to use the Berger 105gr VLD).       Or is it just a 'fad' and there is no real measurable benefit.
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