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Rifles, Reloading, Optics, Equipment
Reloading
Working up a good Load???
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<blockquote data-quote="benchracer" data-source="post: 1196045" data-attributes="member: 22069"><p>I also use the seating depth test to fireform brass for the powder charge workup. After I started using a chrono during load workup, I stumbled onto the fact that there is often a large difference in velocity produced by a given powder charge between virgin brass and once-fired brass. Unless you are working up a load only intended for use in virgin brass, you will be better served to do development with brass fired in your rifle.</p><p> </p><p>Once the seating depth test is complete, I proceed with the powder charge workup. I have two different methods that I can follow: a non-instrumented method and an instrumented method.</p><p> </p><p>The non-instrumented method I have used, with consistent success, can be found here: </p><p> </p><p><u><u><a href="http://optimalchargeweight.embarqspace.com/#/ocw-instructions/4529817134" target="_blank">OCW Overview - Dan Newberry's OCW Load Development System</a></u></u></p><p> </p><p> </p><p>The instrumented method I use came from information furnished to me by a fellow forum member: engineering 101 (pdf attached below). It is a method that revolves around using OBT (Optimum Barrel Time) to compute expected velocity nodes. It requires an accurate chronograph and a copy of Quickload (which generates barrel time data in its load charts).</p><p></p><p>It is simply a matter of finding a powder charge that produces muzzle velocities in the correct range. As powder charges progress, the ES and SD numbers typically become smaller as the node is approached, then bigger as it is passed. I have found this method to be useful, efficient, and effective. I have often been able to produce very accurate loads simply by tuning the velocity across a chrono, taking them to the range to verify them later.</p><p> </p><p>Attached is an example of results I obtained using this method to tune a Mossberg MVP in 5.56 NATO, using 75 AMAX'S and CFE 223. The waterline on the target was shot at a laser-ranged distance of 344 yards:</p></blockquote><p></p>
[QUOTE="benchracer, post: 1196045, member: 22069"] I also use the seating depth test to fireform brass for the powder charge workup. After I started using a chrono during load workup, I stumbled onto the fact that there is often a large difference in velocity produced by a given powder charge between virgin brass and once-fired brass. Unless you are working up a load only intended for use in virgin brass, you will be better served to do development with brass fired in your rifle. Once the seating depth test is complete, I proceed with the powder charge workup. I have two different methods that I can follow: a non-instrumented method and an instrumented method. The non-instrumented method I have used, with consistent success, can be found here: [U][U][URL="http://optimalchargeweight.embarqspace.com/#/ocw-instructions/4529817134"]OCW Overview - Dan Newberry's OCW Load Development System[/URL][/U][/U] The instrumented method I use came from information furnished to me by a fellow forum member: engineering 101 (pdf attached below). It is a method that revolves around using OBT (Optimum Barrel Time) to compute expected velocity nodes. It requires an accurate chronograph and a copy of Quickload (which generates barrel time data in its load charts). It is simply a matter of finding a powder charge that produces muzzle velocities in the correct range. As powder charges progress, the ES and SD numbers typically become smaller as the node is approached, then bigger as it is passed. I have found this method to be useful, efficient, and effective. I have often been able to produce very accurate loads simply by tuning the velocity across a chrono, taking them to the range to verify them later. Attached is an example of results I obtained using this method to tune a Mossberg MVP in 5.56 NATO, using 75 AMAX'S and CFE 223. The waterline on the target was shot at a laser-ranged distance of 344 yards: [/QUOTE]
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Working up a good Load???
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