My 8 twist Brux 7RM really does well with 175's and seems to like RL-25 better than RL-22 with that bullet weight.
DF
Bet 25, 26 and even Retumbo would be good, although I've never tried them in the 7 Mag.
Probably so with that wt. bullet, may add H-1000 to that list.
My 7RM also likes the 180 gr. VLD with RL-25. Not sure how well the VLD would do in Africa, seems to work pretty well on most BG critters, quick kills.
Wonder if it gets used that much in Africa?
DF