I have the S&B 4-16-42 on a 20moa base, shooting a 6.5 Creedmore. Used up about 2 mils for 100yrd. zero, will I have plenty left to 1000yds? Dont have tables for the Creedmore, but seems the drop was around 7.2 at 1000. Will the 20 moa base work or would it be best to go to a 30 moa base?