I run long range matches in Rawlins, WY and though of this due to COVID. I have spoken to the nra and they will support it so it can actually become an approved match. I was thinking 600 yard only because the people I shoot with are F class shooters.
Personally I like the pistol shoot format. There are a group of us who shoot 500, 750 and 1000 yards with "pistols" off of a bench. We hold a 3 day match every year in Sundance, WY. So there are about 30 of us in the group. It's call the MOA Cold Turkey Pistol Match. Can't find an active to the program but this article does a fair job of explaining it.
HTTPS://sierrabullets.wordpress.com/2015/06/19/moa-cold-turkey-1000-yard-handgun-match-report/nk
I would totally support the idea of the postal match. With pistols, even better. Or have a rifle and a pistol category.