Don't over think it. If your feeder is 100yds away zero at 100yds. If it's 150 - 300 yards away, sight in 2" high at a 100yds and you will be within an inch at 200yds and about 7" low at 300yds.
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I use the Hornady ballistic calculator app. Had great success with it for my .270 zeroed at 100 yard, made a 330 yard shot on an antelope last year using the app input with my specific bullet specs, told me exactly how much to dial on my scope.
I didn’t get the app out while in front of the antelope. I pretty much just memorized the MOA clicks out to 300.
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