I just finished doing mine. After testing H4350, N550, N555, N160, RL16 and RL15.5, I decided to go with RL15.5. I also tested the ELDm and SMK. The 131 SMK shot better, more consistent. Group is .155" velocity is 2759. Load is 34.2 with 131 at .035 off lands. 4 shots at 100 yards.