I loaded the 300 Grain CEB Safari Solid with 71 grains of RL15 for 2530 FPS. A couple things I have found; First, these bullets don't develop as much pressure as most traditional construction bullets, so I had to use 3 grains more RL15 to get the same velocity as 68 grains with 300 grain A-Frame. Second, be sure to crimp between driving bands (most likely 1st and second). If you crimp in front of first driving band you will most likely suffer from recoil setback of bullet in magazine box. The neck tension is not enough to hold these bullets in place, as they only contact the case on the driving bands.