You need a good quality spotting scope.
Clear scope with acceptable adjustments and reticle.
Ballistic calculator. I use shooter.
Rifle and load capable of staying above transonic at 1,000 yards.
I would say 30-50 rounds of that load to start at 300 and progress through the targets to 1,000.
Am I missing anything Josh?
I didn't need a spotting scope, did you? Its def something to have but Lawrence had one when I went. I only mention that because its a pretty big expense if he doesn't have one already. Hell, I still dont have one, anytime someone spots me they've been on a gun.
I would just add front/rear support to your list.