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Rifles, Reloading, Optics, Equipment
Reloading
Very first ladder test, take a look.
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<blockquote data-quote="green 788" data-source="post: 94281" data-attributes="member: 3781"><p>grit,</p><p></p><p>The swipe is more at me than you. BH takes exeption to the OCW method of load development. He believes that OCW works (or at least he has said as much in the past), but he believes that the load one arrives at via the OCW method isn't going to be an accurate load for long range.</p><p></p><p>The truth is that OCW does <em>exactly</em> what the ladder test attempts to do. As I mention, sometimes the ladder test works, but sometimes it does not. The OCW load development test not only works MUCH more often than the ladder test, but OCW also provides more meaningful results.</p><p></p><p>Working backwards, if I were to take my .243 win (Remington 788) and fire a ladder test with IMR 4831 and Hornady 105 AMAX bullets, I would--if the test was conducted properly--come to the same conclusion that I did with OCW. In other words, 40.4, 40.7, and 41.0 grains would land tight on the target at 300 yards. Do I know this for sure? Yes, I do. Because I always shoot a 300 yard bracket group to "prove" a suspected OCW load. However, initial OCW testing is done at 100 yards, because this helps factor out the wind to a large degree, and most folks have easier access to 100 yard ranges.</p><p></p><p>However, if I skip the OCW round robin test at 100 yards and go straight to the ladder test at 300 yards, I <em>might</em> find that 40.7 is in the center of a sweet spot. But then again, I might not conclude that. If one shot of the 40.4, 40.7, 41.0 string lands off course (for whatever reason) then the whole test becomes useless.</p><p></p><p>And we must, realistically speaking, accept the fact that since we're human we're going to pull a shot out of the group every now and then. Otherwise, we could shoot bugholes day in, day out at 300 yards. And no one can do that. No one can even do it at 200.</p><p></p><p>But what I'm getting at is this: The ladder test--when conducted perfectly--will indeed show you the same cluster of shots that the OCW test indicates at 100 yards. It's just that the OCW test has the advantage of three shots at each charge level, and these are fired across a long time limit and wider barrel and shooter condition range, so if they land close, you can bet the farm that <em>that's</em> where xx.x grains of powder will put that bullet. With only one shot, it could be the powder that put that bullet there, or it could be some error factor.</p><p></p><p>Dan</p></blockquote><p></p>
[QUOTE="green 788, post: 94281, member: 3781"] grit, The swipe is more at me than you. BH takes exeption to the OCW method of load development. He believes that OCW works (or at least he has said as much in the past), but he believes that the load one arrives at via the OCW method isn't going to be an accurate load for long range. The truth is that OCW does [i]exactly[/i] what the ladder test attempts to do. As I mention, sometimes the ladder test works, but sometimes it does not. The OCW load development test not only works MUCH more often than the ladder test, but OCW also provides more meaningful results. Working backwards, if I were to take my .243 win (Remington 788) and fire a ladder test with IMR 4831 and Hornady 105 AMAX bullets, I would--if the test was conducted properly--come to the same conclusion that I did with OCW. In other words, 40.4, 40.7, and 41.0 grains would land tight on the target at 300 yards. Do I know this for sure? Yes, I do. Because I always shoot a 300 yard bracket group to "prove" a suspected OCW load. However, initial OCW testing is done at 100 yards, because this helps factor out the wind to a large degree, and most folks have easier access to 100 yard ranges. However, if I skip the OCW round robin test at 100 yards and go straight to the ladder test at 300 yards, I [i]might[/i] find that 40.7 is in the center of a sweet spot. But then again, I might not conclude that. If one shot of the 40.4, 40.7, 41.0 string lands off course (for whatever reason) then the whole test becomes useless. And we must, realistically speaking, accept the fact that since we're human we're going to pull a shot out of the group every now and then. Otherwise, we could shoot bugholes day in, day out at 300 yards. And no one can do that. No one can even do it at 200. But what I'm getting at is this: The ladder test--when conducted perfectly--will indeed show you the same cluster of shots that the OCW test indicates at 100 yards. It's just that the OCW test has the advantage of three shots at each charge level, and these are fired across a long time limit and wider barrel and shooter condition range, so if they land close, you can bet the farm that [i]that's[/i] where xx.x grains of powder will put that bullet. With only one shot, it could be the powder that put that bullet there, or it could be some error factor. Dan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Very first ladder test, take a look.
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