Never go from 25 yards to 100 yards.
Go back to 25, recheck with 3 shots, move out to 50 yards, 3 shots, 75 yards, 3 shots.
I know that my shots when sighted 2" high @ 50 drift a good 2 or 3" to the right.
You are using a lot of powder so i am not quite sure how that bullet will act at 100 yards.
Just because they were in one hole at 25, dont mean you will get good groups @ 100.