I'd start at 25 yards and take the time to get it right on the x at that distance. Should put you a tad high at 100 and ready to go hunting.
Yup. I did my 336 with 4 sheets of 8.5x11 paper at 25 yards with a black spot in the middle. If you're further off than that at 25 yards, it's time for the Burris rings with the offset inserts to adjust before messing with the internal scope adjustment.
