Aaaah, so thats who you were referring to, I wondered that

Personally I would stick with 400 grs in any of the 416s, they did the job for 90 odd years, can't see the need to change now, but neither can I see the need to load hotter than than the original loads were advertised at in this caliber, again, 90 years & all that. I'll leave the hot rodding to the Weatherby fraternity. Its hard to see who Norma's target market is for their PH stuff. I can't see too many PHs going for that sort of loading or price, obviously aiming for those with more money than wisdom ( perhaps that should be knowledge.)
Steve