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Rifles, Reloading, Optics, Equipment
Reloading
How far apart are "nodes"
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<blockquote data-quote="el matador" data-source="post: 990085" data-attributes="member: 12193"><p>This has been a great discussion. I buy the "theory" of an oscillating shock wave, and that there are optimal times for the bullet to exit with respect to such phenomena. Using barrel time seems like it has merit, and I would like to explore that. I also believe there are many other variables at play which create additional vibrations or shock waves, one of the most significant being seating depth. And on top of that, the OCW method holds some water too! I'm starting to think that a great load is a combination of good barrel time, stable powder charge and finding a sweet spot amidst all the other vibrations.</p><p></p><p>The reason I posted this topic to begin with was that I found a relatively accurate load for a 300 WM. It is a pretty mild load however. With virgin brass and 76.0 grains H1000 I sent a trio of 208 Amax's into a .320" group, chrono'd at about 2750 fps. I believe with fire formed brass I'll get a little better velocity, and I can step up to 78 grains or more...but how far do I need to go before I hit another node? I think 2950 fps is about the max I can push those bullets. </p><p></p><p>Looking at the chart from the shock wave theory: Each node is 8-13% greater than the one preceding it, so roughly 8-13% more velocity would be a likely spot for another node. 8% puts me at 2970 fps, so it might be just barely possible with this powder and bullet. It's not real scientific but it's the kind of rough approximation I was looking for. I wish I had quick load right now so I could make some virtual reloads!</p></blockquote><p></p>
[QUOTE="el matador, post: 990085, member: 12193"] This has been a great discussion. I buy the "theory" of an oscillating shock wave, and that there are optimal times for the bullet to exit with respect to such phenomena. Using barrel time seems like it has merit, and I would like to explore that. I also believe there are many other variables at play which create additional vibrations or shock waves, one of the most significant being seating depth. And on top of that, the OCW method holds some water too! I'm starting to think that a great load is a combination of good barrel time, stable powder charge and finding a sweet spot amidst all the other vibrations. The reason I posted this topic to begin with was that I found a relatively accurate load for a 300 WM. It is a pretty mild load however. With virgin brass and 76.0 grains H1000 I sent a trio of 208 Amax's into a .320" group, chrono'd at about 2750 fps. I believe with fire formed brass I'll get a little better velocity, and I can step up to 78 grains or more...but how far do I need to go before I hit another node? I think 2950 fps is about the max I can push those bullets. Looking at the chart from the shock wave theory: Each node is 8-13% greater than the one preceding it, so roughly 8-13% more velocity would be a likely spot for another node. 8% puts me at 2970 fps, so it might be just barely possible with this powder and bullet. It's not real scientific but it's the kind of rough approximation I was looking for. I wish I had quick load right now so I could make some virtual reloads! [/QUOTE]
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Reloading
How far apart are "nodes"
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