20 degree incline or decline will certainly result in a few clicks difference at longer range. At 100 yards it won't make much difference at all. Incline would be +20 degrees.. decline -20 degrees.
for example: distance to target is 400 yards:
with no incline or decline would equal 6.2 MOA of elevation correction.
target at 400 yards with 20 degree incline: 5.6 MOA of elevation correction
Just an example from my ballistic app for my 260 Rem load data.
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