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Audette ladder test questions
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<blockquote data-quote="AJ Peacock" data-source="post: 285132" data-attributes="member: 4885"><p>Kirby,</p><p></p><p>To answer your question, I haven't run the same test on different days. I would expect the velocity information to line up better than the point of impact info. I put more emphasis on the velocities than the point of impacts. </p><p></p><p>I look at the results as 'areas to try' and have had very good luck when using it in that way. Another way to look at it is that the results have shown me loads NOT to use (drastic swings between increments). The ladder tests I've performed have all resulted in loads that shoot 1/2moa or better, which might not be the 'best' possible loads, they are loads that easily meet my requirements.</p><p></p><p>I expect that with a quality rifle and chronograph, I could perform a ladder test and pick a good area with just the velocity measurements. Then check the ES/SD and then see how it shoots at LR. Statistically it would probably be just as good. </p><p></p><p>When I decided to try RL-22 for the first time in my 7RM, I did a ladder using RL22/160AB. I found AND verified a load with 24 rounds using RL22 (14 shot ladder and two 5 shot groups). The velocity spread across the node added up to 14fps and the total POI spread was .5moa (average .25moa). When I verified the load at LR, it shot sub .2moa! Maybe I got lucky?</p><p></p><p>I might have found this load using other methods, but I'm sure I would have shot more rounds to do so. I had a similar experience when I worked up my first loads in a Savage 300WSM. 1/3moa load in around 20 shots!</p><p></p><p>In the end, any process that is used consistently on quality rifles is likely to give good results.</p><p></p><p>I find the ladder method good at giving me a process oriented way of quickly understanding the performance of a powder/bullet combo.</p><p></p><p>AJ</p></blockquote><p></p>
[QUOTE="AJ Peacock, post: 285132, member: 4885"] Kirby, To answer your question, I haven't run the same test on different days. I would expect the velocity information to line up better than the point of impact info. I put more emphasis on the velocities than the point of impacts. I look at the results as 'areas to try' and have had very good luck when using it in that way. Another way to look at it is that the results have shown me loads NOT to use (drastic swings between increments). The ladder tests I've performed have all resulted in loads that shoot 1/2moa or better, which might not be the 'best' possible loads, they are loads that easily meet my requirements. I expect that with a quality rifle and chronograph, I could perform a ladder test and pick a good area with just the velocity measurements. Then check the ES/SD and then see how it shoots at LR. Statistically it would probably be just as good. When I decided to try RL-22 for the first time in my 7RM, I did a ladder using RL22/160AB. I found AND verified a load with 24 rounds using RL22 (14 shot ladder and two 5 shot groups). The velocity spread across the node added up to 14fps and the total POI spread was .5moa (average .25moa). When I verified the load at LR, it shot sub .2moa! Maybe I got lucky? I might have found this load using other methods, but I'm sure I would have shot more rounds to do so. I had a similar experience when I worked up my first loads in a Savage 300WSM. 1/3moa load in around 20 shots! In the end, any process that is used consistently on quality rifles is likely to give good results. I find the ladder method good at giving me a process oriented way of quickly understanding the performance of a powder/bullet combo. AJ [/QUOTE]
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