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Long Range Hunting & Shooting
Riflemans Rule
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<blockquote data-quote="Greyfox" data-source="post: 637547" data-attributes="member: 10291"><p>I have used the riflemans rule for quite a while for shots out to about 500 yards on game at smaller angles of 30 degrees or less and it has worked ok. This rule simply multiplies the look angle cosine by the slant distance to get a correction range in meters or yards. My understanding(sticking my neck out), is that the basic problem for longer ranges and steeper angles is that this rule does not take into account your specific load's change in velocity that occurs over the distance to the shot. It also doesn't account for changes in the pull of gravity or air density that occur if the angle is steep enough to result in a large elevation difference between your shooting position and where the target is. It also doesn't account for gravitation effects between up or down shots. It's not perfect, but a way to better correct for at least the change in velocity effect at most practical hunting angles is to multiply the same cosine factor of the look angle of the slant range by the drop in inches that would be used for the shot as if that slant range distance was a level reading. You are basically correcting a drop value instead of a distance value which helps correct for the velocity difference between you position and your target. In recent years, I have just plugged the look angle into my FTE ballistic calculator that appears to work well, at least at the distances and angle I hunt in which the angles are not extreme. I'm not sure what the algorithm is in the devise, but it very likely corrects for the velocity, and maybe the other factors of up/ down, air density etc. I have tested my recently purchased G7 rangefinder and compared it to the FTE for my load and the drop data is identical for a 400 yard, 13 degree angle. I will try longer ranges and steeper angles when I get a chance.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 637547, member: 10291"] I have used the riflemans rule for quite a while for shots out to about 500 yards on game at smaller angles of 30 degrees or less and it has worked ok. This rule simply multiplies the look angle cosine by the slant distance to get a correction range in meters or yards. My understanding(sticking my neck out), is that the basic problem for longer ranges and steeper angles is that this rule does not take into account your specific load's change in velocity that occurs over the distance to the shot. It also doesn't account for changes in the pull of gravity or air density that occur if the angle is steep enough to result in a large elevation difference between your shooting position and where the target is. It also doesn't account for gravitation effects between up or down shots. It's not perfect, but a way to better correct for at least the change in velocity effect at most practical hunting angles is to multiply the same cosine factor of the look angle of the slant range by the drop in inches that would be used for the shot as if that slant range distance was a level reading. You are basically correcting a drop value instead of a distance value which helps correct for the velocity difference between you position and your target. In recent years, I have just plugged the look angle into my FTE ballistic calculator that appears to work well, at least at the distances and angle I hunt in which the angles are not extreme. I'm not sure what the algorithm is in the devise, but it very likely corrects for the velocity, and maybe the other factors of up/ down, air density etc. I have tested my recently purchased G7 rangefinder and compared it to the FTE for my load and the drop data is identical for a 400 yard, 13 degree angle. I will try longer ranges and steeper angles when I get a chance. [/QUOTE]
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