lol...Actually shooting at 100 is easier than most think...with practice...
Just as 50-60yds is...if you can shoot 20-30-40 yds consistantly
Back in the day of slower bows I had 100 yds down pat with tip of arrow...now I may have to paint an outer dot on my Ugly Cookie...lol
*Cheat Hint* on a calm day a small helim balloon and six feet of cord will give you an aim point...lol
Im up for the challange, sounds like fun....
Neil