I have been shooting some of the new 425 gr Cutting Edge bullets out of the Bartlien 13/6.5 gain twist barrel. This barrel loves these bullets. First five shot group at 1770 yds was .5 vertical and .75 horizontal. BC seems to be around 1.0 at 1000 yds and .96 at 1770. I fired at Moa sized targets at various distances out to 1770. This thing is bad to the bone.