Sorry for the late response, work has been brutal and the weather has been tough as well. I finely got out shooting because I just got a new smokeless muzzleoader(Apex Slufoot conversion). The scorpion PT gold in my LDR with 77 grains by weight of Bh209 with a black crush rib crossed the Chrony at an average of 1977 fps. Same setup with harvester smooth black was 2006 fps. In my gun the crush rib loads to easy.