I use the trial and error method by eyeballing it. Even using a plumb line isn't accurate if the rifle isn't resting level and that is the hardest part. I've been doing this long enough that I'm usually right on. But sometimes after I get to the range and start shooting beyond 100 yards I'll see that I'm off a bit and I may have to fine tune it some.
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"If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong"
Winston Churchill
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