Hornady's orignal cases for the 500 S&W were made with Large Pistol Primer pockets. New cases, which are marked "LR" will be made with a Large Rifle Primer Pocket.
My powder charges vary when I drop them. What can I do to make them uniform?
Static can cause charges to vary. Take a dryer sheet and rub it vigorously on the ouside of the powder tube. This will discharge the static and make the charges uniform.