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Load Tuning By Jerry Teo
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<blockquote data-quote="Pdvdh" data-source="post: 442528" data-attributes="member: 4191"><p>Yes. That's been my common experience. I load with different powders and vary powder charges prior to tweaking seating depths. The only time I've seen seating depth affect accuracy to the same quantitative affect as varying powder charge, was changing from jammed into the lands compared to just off the lands. Other than that, I've not experienced dramatic changes to group sizes by changing seating depth.</p><p></p><p>I've about come to the conclusion that differing seating depths affect groups sizes due to the changes in muzzle velocity produced by changing the bullet seating depths. What I mean by this, is when bullet seating depth is increased, while maintaining a constant powder charge, MV decreases, and I wonder if this doesn't result in obtaining a good shooting load - in the same way that changing MV by varying powder charge can result in obtaining a good shooting load. I must admit that <em>I've never heard or read anyone else express this concept though</em>. </p><p></p><p>But changes in powder charge weights can obviously cause a much greater change in MV than changes in seating depths with any given (constant) powder charge. So I primarily alter powder charges in the search for the one-hole-group load. After I believe I've found an optimum powder charge which is yielding MV within the ballpark-range I'm seeking, I may or may not continue to play with different seating depths. The refinement of powder charge alone is usually enough to yield the accuracy I'm searching for.</p><p></p><p>Hope that makes sense. I mean, you may not agree, but I hope you understand my communication on the subject.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 442528, member: 4191"] Yes. That's been my common experience. I load with different powders and vary powder charges prior to tweaking seating depths. The only time I've seen seating depth affect accuracy to the same quantitative affect as varying powder charge, was changing from jammed into the lands compared to just off the lands. Other than that, I've not experienced dramatic changes to group sizes by changing seating depth. I've about come to the conclusion that differing seating depths affect groups sizes due to the changes in muzzle velocity produced by changing the bullet seating depths. What I mean by this, is when bullet seating depth is increased, while maintaining a constant powder charge, MV decreases, and I wonder if this doesn't result in obtaining a good shooting load - in the same way that changing MV by varying powder charge can result in obtaining a good shooting load. I must admit that [I]I've never heard or read anyone else express this concept though[/I]. But changes in powder charge weights can obviously cause a much greater change in MV than changes in seating depths with any given (constant) powder charge. So I primarily alter powder charges in the search for the one-hole-group load. After I believe I've found an optimum powder charge which is yielding MV within the ballpark-range I'm seeking, I may or may not continue to play with different seating depths. The refinement of powder charge alone is usually enough to yield the accuracy I'm searching for. Hope that makes sense. I mean, you may not agree, but I hope you understand my communication on the subject. [/QUOTE]
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