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Rifles, Reloading, Optics, Equipment
Reloading
30-06 OCW Load Development Help
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<blockquote data-quote="dsculley" data-source="post: 1365395" data-attributes="member: 77514"><p>Many times when you run an OCW and you see a group with 2 rounds touching and a third flier it is due to shooter error. The rub is that is always the case. According to Dan Newberry, you will usually find nodes about 3% apart. If you can identify a scatter node, you can divide or multiply that charge by 1.015 to find the accuracy node. In your case, I suspect that 55.2 has a shooter induced flier. On the other hand, 56 does look like a scatter node. If you do the math using 56 as the scatter, that points to 55.2 (or near there) as the accuracy node. That is supported by your target if the flier at 55.2 was shooter induced.</p><p></p><p>As was said earlier, depending on the size of your chamber and how much the brass grew on firing, the actual node could change. Measure your fired brass and compare it to new brass to see how much it grew. Just remember that it usually takes 3 firings to completely fire form brass to a chamber. When I am working up a new load, if I start with new brass I will not finalize a load until I have had the brass through at least 3 cycles. When I built my 6.5x47 I used a piece of new brass to head space the barrel and set the barrel for .002" clearance. With this set up, I get nearly identical performance with new and fire formed cases. </p><p></p><p>Once I have settled on a charge, I will load three rounds of that charge and three rounds each at +/- 0.1 gr from that charge. I shoot three groups using 1 of each charge weight per group. If all three of those groups are within my predetermined parameters then I am finished with load development. I may tweak seating depth at that point. (I will have run the Berger seating depth test before starting load development so I know my seating depth should be close.)</p></blockquote><p></p>
[QUOTE="dsculley, post: 1365395, member: 77514"] Many times when you run an OCW and you see a group with 2 rounds touching and a third flier it is due to shooter error. The rub is that is always the case. According to Dan Newberry, you will usually find nodes about 3% apart. If you can identify a scatter node, you can divide or multiply that charge by 1.015 to find the accuracy node. In your case, I suspect that 55.2 has a shooter induced flier. On the other hand, 56 does look like a scatter node. If you do the math using 56 as the scatter, that points to 55.2 (or near there) as the accuracy node. That is supported by your target if the flier at 55.2 was shooter induced. As was said earlier, depending on the size of your chamber and how much the brass grew on firing, the actual node could change. Measure your fired brass and compare it to new brass to see how much it grew. Just remember that it usually takes 3 firings to completely fire form brass to a chamber. When I am working up a new load, if I start with new brass I will not finalize a load until I have had the brass through at least 3 cycles. When I built my 6.5x47 I used a piece of new brass to head space the barrel and set the barrel for .002" clearance. With this set up, I get nearly identical performance with new and fire formed cases. Once I have settled on a charge, I will load three rounds of that charge and three rounds each at +/- 0.1 gr from that charge. I shoot three groups using 1 of each charge weight per group. If all three of those groups are within my predetermined parameters then I am finished with load development. I may tweak seating depth at that point. (I will have run the Berger seating depth test before starting load development so I know my seating depth should be close.) [/QUOTE]
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30-06 OCW Load Development Help
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