Recent content by ptosis

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    Best ballistic calculator currently?

    The 6DOF bits only apply to Lapua projectiles, which they have data for. In practice, this means accurate spin drift calculations (significantly more accurate than Litz's formula, which everybody else seems to use), and accurate predictions of transsonic stability. Other than that, it is just...
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    How To Use Custom Drag Factors(CDF)

    Thanks! So it's basically a Cd value multiplier (the same for the whole custom Cd/Mach curve).
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    How To Use Custom Drag Factors(CDF)

    Just out of curiosity, and for my personal understanding: technically the CDF is just a BC multiplier, correct ?
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    Another Picture Thread - All Other Semi-Autos

    The 3-lug "K" is a beauty indeed! HK? Functional full?
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    Another Picture Thread - All Other Semi-Autos

    What a beautiful piece you have here! I just love the wood furniture!
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    Another Picture Thread - All Other Semi-Autos

    'fcourse not. As it is written: "Then, shalt thou count to three. No more. No less."
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    Another Picture Thread - All Other Semi-Autos

    if I may adventure a question -- what is the AGOG you've put on it, and why ?
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    Another Picture Thread - All Other Semi-Autos

    The third brother has arrived. I've been hunting for the original, uncastrated full-auto Stgw57, for a few years now, and finally -- here it is! Top to bottom, all original full-autos: - Swiss army issue Stgw57 - German contract FN-FAL, the army issue G1. Alas, not the border guards (or...
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    Another Picture Thread - All Other Semi-Autos

    I do not have much experience with the SCAR 17 – maybe 100 rounds shot prone at 300 m at our village range (not further, and not dynamically), so can't really state anything conclusive in that sense (SCARs in our parts are just insultingly expensive). As compared to the HK 417, it is pretty much...
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    Another Picture Thread - All Other Semi-Autos

    Now that's a rackful of Insane Beauty! Love the 34s! And the M2, but of course, what a splendid instrument!
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    a geek’s delight: reverse engineer a distance-velocity table to Cd/Mach curve

    Re: 2000+ yards -- this is über-cool! This said, if it is not a trade secret, how would you go about, for example, Mach 0.5 for a .375 CT? Multiple radars covering subsequent overlapping trajectory segments? Extrapolation using similar shaped (but smaller calibre) projectiles? Shooting at...
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    Labrabaco: a G7 BC calculator from Labradar tracks

    For the record: I entirely agree with the opinion of Cal from PRB, quoted above, and with the unnamed "industry pro" that he is referring to. Because of obvious power limits, it is totally illusory to expect Labradar to produce meaningful data for a full bullet-specific Cd/Mach curve, or, as...
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    Another Picture Thread - All Other Semi-Autos

    Well, for correct terminology, here are a few gas guns then (mostly semi-autos).
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    Another Picture Thread - All Other Semi-Autos

    Strictly speaking, you're right -- it's recoil, not gas impingement.
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    Another Picture Thread - All Other Semi-Autos

    My favourite long-range .308 gas gun. A bit off-topic though, as it's not a semi-auto.
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