I recently acquired 50 rounds of 470 NE by Nyati, Inc. They are listed at 1150 fps with a 500r round nose jacketed bullet - powder and charge not indicated. I have not tried them yet, but the idea certainly interests me for other reduced loads for my 450/400, 450 NE and 458 Lott. Apparently, the standard powder for such reduced loads is Accurate 5744. According to Terry Wieland in his Dangerous-Game Rifles tome, one should load a given case to the base of the bullet (i.e., determine full-case capacity) with said powder and then use 40-50% of the measured load for lead bullets and 60-65% for jacket bullets. I am seeking information from those who have tried such loads. I would add that since Nyati is not using lead bullets with highly reduced loads, it would seem that is not necessary other than lead bullets are normally less expensive.