An update. I have continued to tinker with loads for the .500/.465 NE. The load I am currently using is the most accurate I have tried to date. I am using 78 grains of IMR3031, F215M primers, 2 grains of polyfill and 480 grain Woodleigh SPs. Very accurate and easy on the shoulder. Velocity hovers around 2100 fps, slightly more. Ejection and opening are easy, primers are not deformed, brass does not require excessive trimming. It will put ten rounds in a two inch circle at 50 yards off of sticks assuming I don't muck things up on my end. Just wanted to pass the information along.

Great rifle ! Nice work on regulation load.

One advantage of using IMR 3031 is since you are only using 78 grains versus over 105 of H-4831 recoil is significntly reduced.

465H&H