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Another variable is the height of the scope above the bore. With the popularity of large objective scopes today, the line of sight is higher than in the past. This will extend the zero range when the rifle is sighted 2" above the point of aim. Iron sights will shorten the zero range compared to a scoped rifle.
BTW, the standard sight line used in virtually all of today's loading manual ballistics tables is 1.5" above the bore....
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