What is the available MOA on your elevation turret? (meaning total MOA or Mils in your case) and also how much elevation do you have left available from your 100 or 200 yard zero? I have a .260 Rem and at 1400 yards it my ballistic app says about 55 MOA of elevation is needed or 16 MRAD. your 308 should be in the same ballpark, with maybe a little more elevation needed, but that would depend on your MV and bullet BC.
My Sightron has 80 MOA of total elevation and 64 MOA still available on elevation turret from my 100 yard zero... I run a 20 MOA rail on mine. Ballistic app says I'm good out to 1500 yards, but I haven't "trued" that far out. my MV is 2750 fps shooting the 143 ELD-X (G7= .311).
Hope that helps a little anyway.
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