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OK, I know that some of you guys are bored with all the discussion of lb/ft, because velocity is where the glamour is. So here are the results so far, of velocity measurements, from which the energy figures were derived. Note that with 39.7 grain .30 cal lead, pseudo-tapered outperforms looped. The looped configuration doesn't show a clear advantage until projectile weight reaches 125 grains. (.429 lead) I'm guessing that the crossover point is about 100 grains, but don't have any 100 grain ammo.

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hello sir, looks as if 2040 out performs 1842. so you say you wanna make these tubes scream at 600% correct? so what length must tubes be so that 30" is 600% , and how would i figure this?
 
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