Zeroing a rifle

Zeroing a rifle

This is a discussion on Zeroing a rifle within the Optics forums, part of the Sniping Related category; I have read a lot about zeroing my scope and in many explanations 100 yards is used as a example distance to zero a rifle ...

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Thread: Zeroing a rifle

  1. #1
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    Zeroing a rifle

    I have read a lot about zeroing my scope and in many explanations 100 yards is used as a example distance to zero a rifle scope. And in several discussions/ videos a drawing of the line of site of the scope intersecting with the 'highest' point in the bullet's trajectory at 100 yards (the zero distance) seems to me to be one of two scenarios. Isn't it possible (second scenario) that the line of site of the scope (if gun is stationary and reticle lowered more) could intersect the bullet's trajectory at two points ( A and B)? 'A' being a point along the bullet's ascent (before reaching its highest point along trajectory) and 'B' being a point along the bullet's descent? If so, in the first scenario, the gun would be zeroed at 100 yards, but in the second scenario it would be zeroed at a distance less than 100 yards and another distance farther than 100 yards. Am I understanding things wrong or am I presenting a valid point? If I'm correct, then the rule that a gun will always shoot 'low' if aimed at a target closer or further than the point of zero (100 yards in many explanations) would not always be true (if the second scenario applies). Right? Any advice would be appreciated.

  2. #2
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    This might help you understand the mechanics of what's going on.

    https://blog.cheaperthandirt.com/exterior-ballistics/

    In the illustration, the bullet crosses the scopes line of sight around 30-35 yards based on the illustration or so and then comes down at 100. Obviously this would be slightly different for each round.

    Personally I've never bothered analyzing the exact distance of the up or down on POI on my center fire rifles for two reasons, 1) the difference is relatively small (around 2") or less and I generally shoot at distances well in excess of 100 yds unless I'm doing load development.

    Now if you are looking at shooting a .22LR then you might consider zeroing at 50yds and note your POI's at 10yd increments out to 50 if you want to get squirrels with head shots.
    Last edited by Martino1; 01-13-2020 at 02:56 PM.

  3. #3
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    Quote Originally Posted by Martino1 View Post
    This might help you understand the mechanics of what's going on.

    https://blog.cheaperthandirt.com/exterior-ballistics/

    In the illustration, the bullet crosses the scopes line of sight around 30-35 yards based on the illustration or so and then comes down at 100. Obviously this would be slightly different for each round.

    Personally I've never bothered analyzing the exact distance of the up or down on POI on my center fire rifles for two reasons, 1) the difference is relatively small (around 2") or less and I generally shoot at distances well in excess of 100 yds unless I'm doing load development.

    Now if you are looking at shooting a .22LR then you might consider zeroing at 50yds and note your POI's at 10yd increments out to 50 if you want to get squirrels with head shots.
    +1

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  5. #4
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    In the illustration, the bullet crosses the scopes line of sight around 30-35 yards based on the illustration or so and then comes down at 100. Obviously this would be slightly different for each round.

  6. #5
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    Quote Originally Posted by blankopa View Post
    In the illustration, the bullet crosses the scopes line of sight around 30-35 yards based on the illustration or so and then comes down at 100. Obviously this would be slightly different for each round.
    Is there a question there?

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