In my Mark-X Mauser full stock carbine, 20" bbl, I have had the best luck with
N-201 and Vihtavouri
N-135 . I can't recall the exact load, but I used the same charge with 270 gr. Speers for near 2400 f.p.s.
FWIW, I agree with Ray Atkinson, they are too soft for anything except deer.
I intend to try the Ballistic Tips in my Ruger #1 w/23.6" bbl. I've heard good things about the 286 gr. Hornady's, but have not tried them, as yet.
I've tried the 250 gr. Barnes X's but as usual they yeild 4"-6" groups at 100 yds. I find that unacceptable. And thus far, have never hunted game with them. I expect to remain that way.
FWIW, I always thought the 250 gr. was the perfect 9.3 bullet weight.
The 258 gr. RWS bullet is nicely accurate in my Mauser, but they are extremely scarce...
Grasshopper