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Ladder test results
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<blockquote data-quote="7mmTikkaShooter" data-source="post: 1706617" data-attributes="member: 92915"><p>Going to jump in one more time here in regards to the poi shift. Yes mirage is a factor and so is shooter error. Given the small changes in charge weights here I would lean toward those variables as being the likely culprit for much of that lateral shift. The basic theory around a ladder test though, is not necessarily lateral poi shift but looking for the vertical dispersion. The charge weights that throw shots closer together vertically are more likely to be a stable range in velocities. In long range load development this is one of the most critical variables we're chasing. 300 yards is a bit short for seeing this dispersion (500-600 would be more optimal) but sounds like you're limited on that. One shot per charge might give some error too. Try to run the same test 3 times. Same process, 3 targets. Hopefully after replicating it you can start to hone in on that stable range of powder charge despite what lateral dispersion you're seeing in one target. Like I stated earlier, the addition of a chronograph will really help if it's available. I've used this same method you're using at 300 with success in the past. I think you're on the right track.</p></blockquote><p></p>
[QUOTE="7mmTikkaShooter, post: 1706617, member: 92915"] Going to jump in one more time here in regards to the poi shift. Yes mirage is a factor and so is shooter error. Given the small changes in charge weights here I would lean toward those variables as being the likely culprit for much of that lateral shift. The basic theory around a ladder test though, is not necessarily lateral poi shift but looking for the vertical dispersion. The charge weights that throw shots closer together vertically are more likely to be a stable range in velocities. In long range load development this is one of the most critical variables we’re chasing. 300 yards is a bit short for seeing this dispersion (500-600 would be more optimal) but sounds like you’re limited on that. One shot per charge might give some error too. Try to run the same test 3 times. Same process, 3 targets. Hopefully after replicating it you can start to hone in on that stable range of powder charge despite what lateral dispersion you’re seeing in one target. Like I stated earlier, the addition of a chronograph will really help if it’s available. I’ve used this same method you’re using at 300 with success in the past. I think you’re on the right track. [/QUOTE]
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