Try a few scenarios on a ballistic calculator.
For the 7mm08 30 degrees at 200m give 0.2 mRad (2/3 moa) difference.
At 300m its 0.3 mRad (1 moa).
At 500 m its 0.7 mRad (2 moa).
So, I would only take slope into account from 300m out.
30 degrees is pretty steep and difficult to get into position for.
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