This data is from Barnes' first manual. RL-15 Max. 76.5 grs. @ 2887 f/s; H 380 Max. 78.0 grs. @ 2836 f/s; IMR 4895 72.0 grs. @ 2860 f/s; IMR 4064 Max. 74.0 grs. @ 2872 f/s; Win 748 Max. 72.0 grs. @ 2813 f/s; IMR 4320 Max. 77.0 grs. @ 2897 f/s. Good luck.