I have been testing the new 130 grain 6.5mm Cutting Edge bullet in my 264 STW and 264 Win Mag the past week with excellent results. The bullet is very long and longer than 140 grain lead core bullets therefore the high bc and recommended requirement of a 1-8 twist barrel. They look like little mini missiles. Both rifles shot the bullet extremely well under .5 moa at 500 yards. The 264 STW has a 28" Hart barrel and the 264 Winchester a 26" Hart barrel. The best load in the STW was 82.6 grains Retumbo with a velocity average of 3702 fps. The best group was at the 400 yard target where it shot two through the same hole and the third 1.2" low right of the other two. The oal was 3.871" on the best group which was .022" clearance for the seal tight band. It made contact at 3.893" oal. The 264 win mag had a best load of 68 grains Winchester WMR powder with an average velocity of 3418 fps. The other good load with this rifle was 70 grains of Magpro at 3406 fps. That seemed to be the top velocity range in this rifle before the loads and groups got unstable. Accuracy held .5 moa with both loads.