I’d be interested to hear how the regulation with handloading went. Obviously the results are outstanding! My buddy and I each have an 89b in 500 NE being delivered soon. His is here in the states and will be here this week and mine mid March. We will start the load process and I have 570 grain CEB safari solids ready to go. I’d love to know what load you settled on if you don’t mind sharing.Do everything but elephant in my view. I'd want to be around 5,000 ft/lbs at the muzzle minimum for elephant. Gives you more options in regards to placement. Though I am biased with my Heym .500 NE. I just recently finished developing a load with 570 grain CEB Safari solids than actually turned out to be better than factory accuracy with Hornady at 50 meters off of shooting sticks.