The energy result produced by ballistics programs omits the angular kinetic energy component from bullet spin - it cannot calculate it without barrel twist as an input.
Why is this? It angular/spin energy negligible?
ETA: I found that Litz already answered this on LRH:
http://www.longrangehunting.com/forums/f19/bullet-spin-performance-36927/
Why is this? It angular/spin energy negligible?
ETA: I found that Litz already answered this on LRH:
http://www.longrangehunting.com/forums/f19/bullet-spin-performance-36927/
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