Interesting about you speaking with John B. about his loads. I will admit that it's been a few years since he wrote that article about his loads for the 9.3x62. I've been meaning to try Big Game powder in my 9.3x62 but I haven't done so yet.
I hear you about RL-15 and the 9.3x62. I've been out of the shooting game for that past 15+ years or so and I'm just now easing my way back into it. I just kind of lost interest after my trip to SA in 2005 and I moved on to some other hobbies. (Spent some money on astronomical telescopes; nothing really fancy.) I'm now renewing my interest in shooting and I quickly found out that the times have certainly changed in the shooting world!
IMO, the only problem with RL-15 and RL-17 powders is trying to find some! I think Alliant has gotten out of the powder business (or least selling it to civilian consumers). That came as a big surprise to me. I had good luck with RL-15 in my .35 Whelen and 9.3x62. Now I have to start over and work up some loads; which I have gotten off my lazy rear end and done yet.
Anyway. . . Here's my load that I used in South Africa back in 2005. It worked just fine.
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Cheers! Bob F.