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Rifles, Reloading, Optics, Equipment
Reloading
Newbie Load Development Question - How many rounds and how many grain increments?
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<blockquote data-quote="Rymart" data-source="post: 1142074" data-attributes="member: 3688"><p>Ways to work up a load are like ********, everyone has one...</p><p></p><p>For powder increments, I've always used 1% of the 'middle of the load range', rounded to the nearest .1 grain... So for example if the min was 45.0 gr and the max was 55.0, I'd use 0.5 grain increments.</p><p></p><p>OCW, Ladder test, and similar methods are used to determine the most stabile nodes, and often more tuning is needed (seating depth, neck tension, etc) to achieve optimum precision. In other words, the best nodes in OCW or ladder tests do not always produce the smallest groups. A chronograph is another tool often used to find/tune a load.</p><p></p><p>It only needs to be as complicated as you want to make it. Many people start by just picking a bullet jump (say 0.010" - 0.030", or whatever fits in the magazine if those are too long), loading up 3-rounds each at whatever powder charge increment they choose, and shooting to see what produces the best groups. You could take it a step further and take note of the center location of each group and choose your best group that isn't near where there is a significant shift in the location of group centers between charge increments (read OCW theory if you need clarification on this).</p><p></p><p>I use a modified version of OCW for my load work up most of the time, and have also had luck with ladder tests as long as I shot them at 500+ yards on a calm day (good luck with that in Wyoming where I live). Another suggestion is to look up Eric Cortina's post "Long range load development at 100 yards." on the Accurate Shooter site (6mmBR). That method is simpler than the OCW method and seems to work well for many.</p></blockquote><p></p>
[QUOTE="Rymart, post: 1142074, member: 3688"] Ways to work up a load are like ********, everyone has one... For powder increments, I've always used 1% of the 'middle of the load range', rounded to the nearest .1 grain... So for example if the min was 45.0 gr and the max was 55.0, I'd use 0.5 grain increments. OCW, Ladder test, and similar methods are used to determine the most stabile nodes, and often more tuning is needed (seating depth, neck tension, etc) to achieve optimum precision. In other words, the best nodes in OCW or ladder tests do not always produce the smallest groups. A chronograph is another tool often used to find/tune a load. It only needs to be as complicated as you want to make it. Many people start by just picking a bullet jump (say 0.010" - 0.030", or whatever fits in the magazine if those are too long), loading up 3-rounds each at whatever powder charge increment they choose, and shooting to see what produces the best groups. You could take it a step further and take note of the center location of each group and choose your best group that isn't near where there is a significant shift in the location of group centers between charge increments (read OCW theory if you need clarification on this). I use a modified version of OCW for my load work up most of the time, and have also had luck with ladder tests as long as I shot them at 500+ yards on a calm day (good luck with that in Wyoming where I live). Another suggestion is to look up Eric Cortina's post "Long range load development at 100 yards." on the Accurate Shooter site (6mmBR). That method is simpler than the OCW method and seems to work well for many. [/QUOTE]
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Newbie Load Development Question - How many rounds and how many grain increments?
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