I got this 26" SS Varmit contour 10 twist 308 Winchester barrel from Jim @ Apache about 3 months ago... I've got about 150 rounds down this barrel so far.. Finally found a pretty sweet spot with the 168 SMKs at 42 grains of IMR-4064 and 2.860 OAL. My chrono shows this load running about 2530 FPS but the Strelok trajectory calibration feature uses 2630 FPS to compensate. Pretty decent shooting for me personally...