Well tried the r 17 powder in the 243 ai and it is to fast a powder for the 87 gr. bthp by hornaday( decided to go with that bullet since it basically outperforms the 80 grain because of the higher bc.) We tried r19 which there was no velocity. Also tried r 22 and it didn't work. Tried some magpro and it shows some promise. Started at 51gr and worked up to 53 gr with room for improvement. Has anybody tried Hybrid 100v from hodgen with this bullet selection.