the custom turrets are good and all but the downside is that it is only good for that elevation and for roughly only certain conditions. if the turret is designed around 5000ft elevation and you hunt at 8000 or 2000 it wont work for ya. IMOP the standard target turrets would be work better for ya.
im not at work so i cant check my leup spec charts but i think the internal elevation will be enough on the 6.5-20 to get you to 1K
have a good un
steve