According to this web sites 6 BR details on loading, case prep etc. I am way below stated velocity comparatively speaking. At 30.5 grains of Varget Powder and the 107 SMK I get 2800 fps @ .010 off the lands. About 100 FPS below whats stated here and there, with Lapua and 450's. The barrel is a .237 bore. The opposite of what I would think is that the 205 m give more velocity than the 450's do. Maybe my chrony is off but it seems fine for function. Any comments from similar experiences that you all have had? My accuracy is as good as it can be, I'm satisfied anyway. Thanks !