Your reading the silhouette rules. Different game.
They are not the rules for NRA BPCR target rifle - Creedmoor ( 800- 900- 1000yd matches. ) I know of what I write.
Matches known as NRA - "Black Powder Target Rifle"
Creedmoor -800-900-1000yr - any position
Mid-range - any position
Mid-range - three position
Shot on paper