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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How many FPS between accuracy nodes???
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<blockquote data-quote="el matador" data-source="post: 1182678" data-attributes="member: 12193"><p>I believe nodes are further apart personally. Based on Optimum Barrel Time calculations the nodes are somewhere between 8% to 11% apart, which should correlate pretty closely to velocity. So if you have a node at 2900 fps you'll probably have another one around 3150 to 3200 fps with the same powder and bullet. The reason I'm inclined to believe this is based on my load development techniques. I typically shoot from 5-6% below max to 1% over max (published data) to look for accuracy nodes. If they were 3% apart I would be finding multiple nodes within that range on some occasions, but I have not. In fact sometimes I find zero nodes and move on to a different powder altogether. I can usually find one good node within that 6-7% range, which seems to follow the idea that nodes are around 10% apart velocity-wise. Since each powder builds pressure differently that explains why the nodes may be at higher/lower velocities with each powder. </p><p></p><p>Regarding your HBN coated bullets, you should try to replicate the velocity of your accuracy load that you used with uncoated bullets. Since the coating reduces friction it also reduces pressure and velocity. You'll most likely need to bump up your powder charge a little to restore velocity to where it used to be.</p></blockquote><p></p>
[QUOTE="el matador, post: 1182678, member: 12193"] I believe nodes are further apart personally. Based on Optimum Barrel Time calculations the nodes are somewhere between 8% to 11% apart, which should correlate pretty closely to velocity. So if you have a node at 2900 fps you'll probably have another one around 3150 to 3200 fps with the same powder and bullet. The reason I'm inclined to believe this is based on my load development techniques. I typically shoot from 5-6% below max to 1% over max (published data) to look for accuracy nodes. If they were 3% apart I would be finding multiple nodes within that range on some occasions, but I have not. In fact sometimes I find zero nodes and move on to a different powder altogether. I can usually find one good node within that 6-7% range, which seems to follow the idea that nodes are around 10% apart velocity-wise. Since each powder builds pressure differently that explains why the nodes may be at higher/lower velocities with each powder. Regarding your HBN coated bullets, you should try to replicate the velocity of your accuracy load that you used with uncoated bullets. Since the coating reduces friction it also reduces pressure and velocity. You'll most likely need to bump up your powder charge a little to restore velocity to where it used to be. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How many FPS between accuracy nodes???
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