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  1. BryanLitz

    Range Report Bullet Wobble

    Re: Bullet Wobble The equations for epicyclic motion are well established. The link to the video above is actual output from a 6 degree of freedom simulation to the equations of aeroballistic motion, including epicyclic effects. The summary is that the 'corkscrew' flight path is so minor...
  2. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 I think the reason why the 90 gr .224's aren't favored is due to their 'finicky-ness', for lack of a better word. It's just such a long bullet, and all that bearing surface in such a small bore, with super fast twist... everything adds up against them...
  3. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 We're probably not as far opposed as it may have seemed. The lotto comment was only used to exaggerate the thought process; an analogy to make a point. Not saying that G1 was 'so bad' you might as well play the lotto. The point of the analogy was to say...
  4. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 TiroFijo, Until you shrink to a scale that is on the order of air molecules (much smaller than .17 caliber), the coefficient approach is valid. Frank, I don't know GS personally. But I've measured dramatically different BC's for his bullets than what he...
  5. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiroFijo</div><div class="ubbcode-body">Bryan: "Clearly the drag curve, being non-dimensional, is not affected by the caliber or mass of the standard projectiles, but only by it's...
  6. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lowlight</div><div class="ubbcode-body">Bryan, I have no interest in taking my pixels and going home and again, I acknowledge what a great job you do and what you have done for...
  7. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiroFijo</div><div class="ubbcode-body">... You need firing tests to establish it accurately, and <span style="text-decoration: underline">the larger the shape of diameter...
  8. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: TiroFijo</div><div class="ubbcode-body">Bryan, I agree to use the curve that fits best, but just looking at the nice outlines of the standard bullets is a bit misleading... I...
  9. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 There are several things I'd like to respond to over the last several posts. 1) The algorithm, vs the model, vs the drag curve. Ballistic solvers are comprised of two basic parts: A) The '<span style="font-weight: bold">algorithm</span>', aka the...
  10. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 The LB software is a 'one off'. It doesn't use a standard solver, which means that no commercially available standard G1 or G7 BC's work the way they should with it. For example, if I'm reading your screenshot right, it's showing virtually no difference...
  11. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 We can let go of the business discussion now and just agree that we both work in the shooting industry. But I do want to address the original topic. I think you're on to something that's important to explore. It's easy to show that the G7 drag model is a...
  12. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 What I get from your post is: 11.5" (1 MOA at 1100) of error is unimportant, and SH shares information freely while I don't. You're taking us off topic, but I'll bite. First, if your actual POI is 1 foot different from where it's predicted, there is...
  13. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 You're right, there are many kinds of hammers. Here's the G1 hammer: Then there's the G7 hammer: You have a point that if there's no G7 BC available, or if your software doesn't support G7, then you can 'make do' with G1. But given the choice...
  14. BryanLitz

    Ballistic coefficient G1 and G7

    Re: Ballistic coefficient G1 and G7 Here is a brief explanation of the facts: http://02b0516.netsolhost.com/blog1/2009/06/17/a-better-ballistic-coefficient/ <span style="font-style: italic">CAN</span> you calculate long range trajectories with G1 BC's for modern (boat tail) bullets? yes...
  15. BryanLitz

    308 cal 173gr FMJBT BC

    Re: 308 cal 173gr FMJBT BC <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Redmanss</div><div class="ubbcode-body">0.490 G1, 0.251 G7, produced by Sierra. Source: Applied Ballistics for Long Range Shooting by Bryan Litz Great book and highly recommend it to any...
  16. BryanLitz

    168 Berger VLD Speed?

    Re: 168 Berger VLD Speed? Did you verify that the 168's hit the same POI at 100 yards? It's very common for different bullets to have a different POI even at close range. If you don't check them at 100 yards and go straight to long range, the difference in POI can appear to be an external...
  17. BryanLitz

    Range Report BC/Performance Question: 155 Sc. Vs. 175 SMK?

    Re: BC/Performance Question: 155 Sc. Vs. 175 SMK? Thank you. I totally forgot about that part of the article. As with many technical 'rules of thumb', it's important to consider the caveats. The very next paragraph of that article reads: <div class="ubbcode-block"><div...
  18. BryanLitz

    Rifle Scopes What distance to zero at?

    Re: What distance to zero at? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SGT Ticklefight</div><div class="ubbcode-body">Brian litz has an amazing book with ballistics calculator software included and extensive bullet bc data. I wish he or Berger would release...
  19. BryanLitz

    Litz BC for Hornady 208 HPBT

    Re: Litz BC for Hornady 208 HPBT Sorry, haven't tested it yet. I have data on the 208 Amax, but not the 208 HPBT. -Bryan
  20. BryanLitz

    Staying supersonic at 1000yds with .308?

    Re: Staying supersonic at 1000yds with .308? With many 175 grain bullets (SMK, Nosler CC, Berger OTM, and possibly Hornady 178) the bullet is stable thru transonic anyway, so it's not as important that the bullet stays supersonic. Of course performance (wind deflection, drop, etc) will be...
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