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Rifles, Reloading, Optics, Equipment
Reloading
Advanced loading techniques ????
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<blockquote data-quote="Okanogan" data-source="post: 1312549" data-attributes="member: 90397"><p>I don't believe the MV variation affect on bullet drop is as simple as what is suggested above which implies a linear variation with MV. Here is an AB calculated example for 190gr VLD at 65F, 1200 ft, 50% humidity and standard pressure, 200 yd zero for a 800 yd shot:</p><p></p><p>3000 fps 15.7 MOA (130.6 inches)</p><p>2970 fps 16.1 MOA (134.0 inches)</p><p></p><p>The difference still may not seem that much to some people when viewed as a single variable in shot performance. However, Bryan Litz's work with WEZ modelling does a good job of putting different variables in perspective and makes for an interesting read relative to this thread. He basically points out the combination of different variables uncertainty adds up to more misses and that the combination makes it difficult to isolate a miss to a single variable in some cases. </p><p></p><p>Bryan's relatively new Volume II Modern Advancements in Long Range Shooting has 5 chapters devoted to advanced hand loading which I found interesting and some what counter to typical internet collective wisdom. The Precision Shooting Reloading Guide by Dave Brennan was especially useful to me for a reloading guide after I made the effort to borrow it through the local library.</p><p></p><p>In my own case after reading Bryan and Brennan's works, I do whatever I can to control each variable in hand loading to the maximum extent practical when trying for precision loads. I also try to have tools available to accurately measure my work/results. (e.g., Chrono with Magneto Speed or Lab radar, auto trickler & FX-120I, concentricity gauges, Starett calipers, etc) What is practical depends on time, budget and space available and being recently retired, I am reasonably blessed. I do not claim to be a reloading expert though, which is the reason for providing what I found to be useful references for my own efforts.</p></blockquote><p></p>
[QUOTE="Okanogan, post: 1312549, member: 90397"] I don't believe the MV variation affect on bullet drop is as simple as what is suggested above which implies a linear variation with MV. Here is an AB calculated example for 190gr VLD at 65F, 1200 ft, 50% humidity and standard pressure, 200 yd zero for a 800 yd shot: 3000 fps 15.7 MOA (130.6 inches) 2970 fps 16.1 MOA (134.0 inches) The difference still may not seem that much to some people when viewed as a single variable in shot performance. However, Bryan Litz's work with WEZ modelling does a good job of putting different variables in perspective and makes for an interesting read relative to this thread. He basically points out the combination of different variables uncertainty adds up to more misses and that the combination makes it difficult to isolate a miss to a single variable in some cases. Bryan's relatively new Volume II Modern Advancements in Long Range Shooting has 5 chapters devoted to advanced hand loading which I found interesting and some what counter to typical internet collective wisdom. The Precision Shooting Reloading Guide by Dave Brennan was especially useful to me for a reloading guide after I made the effort to borrow it through the local library. In my own case after reading Bryan and Brennan's works, I do whatever I can to control each variable in hand loading to the maximum extent practical when trying for precision loads. I also try to have tools available to accurately measure my work/results. (e.g., Chrono with Magneto Speed or Lab radar, auto trickler & FX-120I, concentricity gauges, Starett calipers, etc) What is practical depends on time, budget and space available and being recently retired, I am reasonably blessed. I do not claim to be a reloading expert though, which is the reason for providing what I found to be useful references for my own efforts. [/QUOTE]
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Advanced loading techniques ????
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