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Long Range Hunting & Shooting
Quickest way to find an accurate load
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<blockquote data-quote="fiftybmg" data-source="post: 1642969" data-attributes="member: 96316"><p>First choose powder, bullet, primer and brass.</p><p></p><p>None of those choices are simple, but you have to start somewhere, and if you change any of those, you need to develop the load from the beginning again.</p><p></p><p>Then, load at least 3 rounds per powder weight, in increments, from the middle of the published load data to the max. You decide what increment you are happy with, and be sure to allow the barrel to cool between strings.</p><p></p><p>See which load gives you the least velocity variation, you want a maximum of 5 fps difference. Jackpot if each of three shots is exactly the same on the chrony.</p><p></p><p>That is the basis of an accurate load, which can be tweaked by adjusting bullet seating from max AOL down, in increments of 0.001 .</p><p></p><p>At this point, you may not be at max velocity or max pressure, but don't worry about that if you want accuracy. The consistent velocity is more important for accuracy than being at max pressure.</p><p></p><p>Case fill is vital for consistent velocity, if you can find a powder to give you exactly 100% fill with no compaction, it may be the right one.</p><p></p><p>Should your load test not give you less than 5 fps variation, change powder or primer. Repeat untill < 5 fps variation is achieved.</p></blockquote><p></p>
[QUOTE="fiftybmg, post: 1642969, member: 96316"] First choose powder, bullet, primer and brass. None of those choices are simple, but you have to start somewhere, and if you change any of those, you need to develop the load from the beginning again. Then, load at least 3 rounds per powder weight, in increments, from the middle of the published load data to the max. You decide what increment you are happy with, and be sure to allow the barrel to cool between strings. See which load gives you the least velocity variation, you want a maximum of 5 fps difference. Jackpot if each of three shots is exactly the same on the chrony. That is the basis of an accurate load, which can be tweaked by adjusting bullet seating from max AOL down, in increments of 0.001 . At this point, you may not be at max velocity or max pressure, but don't worry about that if you want accuracy. The consistent velocity is more important for accuracy than being at max pressure. Case fill is vital for consistent velocity, if you can find a powder to give you exactly 100% fill with no compaction, it may be the right one. Should your load test not give you less than 5 fps variation, change powder or primer. Repeat untill < 5 fps variation is achieved. [/QUOTE]
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