While I like to keep the bell (objective) as close to the barrel as possible, #1 priority is fit for my head positioning and cheek weld.Could be low, med or high depending on the stock design...however most times med rings are the winner. Like mentioned mount the scope and see how it feels. If yourlifting, canting,etc to have a clearsite pictureexchange them for meds. The best way to test this, just like setting upyour scope for ER. Close your eyes, shoulderthe rifle bringing it/you into theposition like you are going to fire and open your eyes.