Velocity "Nodes" is there a

308sako

New member
Best accuracy/velocity node, which the other "nodes" do not equal?

If I have an accurate load and assumed node at say 2820 ft/secs, can the next node up or down be superior to that, or should they be equal. The cartridge by the way is .308/155gr , not 6 PPC or derivative of same. Another short way of phrasing this would be is there a single best accuracy node in a given barrel?

Part two of this question would be if the "nodes" are expected to be approximately 120 ft/secs apart i the 6 PPC, are they spaced similiarly in other cartridges, or does each cartridge have it's own spread or reach between "nodes?" For instance would the .308 be spaced at say 165 ft/secs?

Thank you for your considered responses.
 
The nodes are not just caliber/cartridge specific... the harmonics of the barrel length comes into play as well. Shorter barrels, the nodes are slightly closer together, longer barrels have them spaced a little further apart. You may find some of the reading here on acoustic shock wave theory and optimal barrel time to be informative. As to whether one node is better than another... I couldn't say.
 
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