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Originally Posted by jatx
Hollis, what I understood Gene to be saying was that he was looking for a shorter range zero that would come close to replicating the 300 yard zero, which would be pretty convenient. Maybe I misunderstood him, though.
Please clarify, how is a short range zero problematic so long as you are within max PBR (and you've assumed the right size kill zone)?
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Jatx, Look at your graph. Two references, 1) where the bullet crosses the line up sight on a upward trajectory and then crosses the line of sight on the downward trajectory. 2) where the bullet ceases a upward path and starts to fall (top of arch) at the line of sight. Then note the difference in distance, and keep in mind, the line of sight is a straight line and bullet path is a arc. Also the distance from center of the barrel and center of the sights/scope come into play. The bullet initially needs to rise to meet the line of sight. Sighting in at a longer distance will insure the bullet crosses the line of sight twice. The first crossing is the short distance zero, the second crossing is the long distance zero.
I am not sure if that explains it completely.
H.