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  1. damoncali

    Spin Drift

    The gravity is the source of the moment, the spin just points it to the right (or left).
  2. damoncali

    Spin Drift

    Drift and jump have nothing to do with each other. Drift is due to a yaw of repose, which is defined as a quasi-steady state yaw (basically, the average yaw) to the side caused by gravity and spin. That yaw is relative to the airflow, which already accounts for wind. YOR imparts a lift force...
  3. damoncali

    Spin Drift

    99% of rifles can't hold .1 mil when fired from a test fixture in a tunnel. There's no way anyone can see that on an open range. Doesn't mean it's not there, but the uncertainty of trying to measure it like that is enormous.
  4. damoncali

    Attempting a 2 Mile Shot: Applied Ballistics | World's Longest Shot Challenge 2018 - Tactiholics™

    This is pure, nut house, insane asylum grade madness. Love it.
  5. damoncali

    50BMG

    Look into the Fifty Caliber Shooters Association. It's been around a long time, and they take their .50s seriously. http://www.1moa.org/
  6. damoncali

    Spin Drift

    Are you talking about an increasing yaw of repose? Seems like yaw has been pretty well documented with 6DOF models.
  7. damoncali

    Spin Drift

    Interesting reading on high angle fire and it's impact on drift (because of base forward flight on the way down): https://catalog.hathitrust.org/Record/101827385 . It's about artillery, but the concepts should be similar for rifles. (Spoiler: you don't have to worry about it.) There is an angle...
  8. damoncali

    Advanced Marksmanship Blinking

    Blinking is involuntary and it occurs well after the bullet has left the barrel. It’s a response to the noise of the shot, and the lag between hearing the shot and the blink is a little under a tenth of a second. The bullet is gone in a few milliseconds. Blink away. It does not matter.
  9. damoncali

    Spin Drift

    It's not a math problem so much as a data problem. Aerodynamic coefficients are simply difficult to nail down with the precision that a lot of ELR shooters want. We know how to calculate drift. Hell - decades ago, they figured out how to calculate the drift when a howitzer projectile is shot 80...
  10. damoncali

    Spin Drift

    I've not seen this documented - do you have a source? I'd be interested in reading up on it. (not the Litz part, the old stuff)
  11. damoncali

    Spin Drift

    Every military source I've seen was much more concerned about artillery than rifles when it came to spin drift. It doesn't surprise me it's not mentioned in rifle courses.
  12. damoncali

    Spin Drift

  13. damoncali

    Spin Drift

    You can get a copy for under a hundred bucks. Amazon is rife with scammers using it to legitimize stolen credit cards, people who would rather put a massive price on an item rather than show it out of stock, and probably more than a few algorithmic pricing programs that just don't work very well.
  14. damoncali

    Spin Drift

    I have no idea how people can see it at the range. I can't even come close. But a spark range can tease out overturning moment and lift coefficients with good accuracy, and then you can get a pretty good calculation from MPM or 6DOF. Yaw cards predate spark ranges, which are significantly more...
  15. damoncali

    Spin Drift

    It all depends on how small a target you want to hit... Personally, I don't get the fun in trying to hit a 10 foot square target super far away. That's artillery, not marksmanship. If you want to hit something smaller, you're going to need to get this stuff right (as right as you can), or use...
  16. damoncali

    Spin Drift

    You could argue it's never worth worrying about because at ranges that it really matters, you're going to need DOPE to have a realistic chance at a first round hit. Taking a cold rifle to a new location, calculating a trajectory at a mile, and hitting it with no previous DOPE on the first shot...
  17. damoncali

    Spin Drift

    It's only useful for first round hits. If you miss your shot by less than the spin drift and didn't account for it, you can blame spin drift. (If your hold was perfect).
  18. damoncali

    Spin Drift

    I'm just saying your chucking an approximate calculation and replacing it with a rule of thumb that is basically a simple curve fit through your DOPE. If you've got DOPE, you don't need a calculation in the first place. The value of calculation is that it's a substitute for DOPE - what you do...
  19. damoncali

    Spin Drift

    Spin drift is not a percentage of drop. You may find that to be true as a rough rule of thumb in some cases, but that's not an improvement over Miller-like simplifications used by some ballistics calculators. You can only dumb it down so much, and percentage of drop is a step too far.
  20. damoncali

    "Centralizing" Support Equipment

    Food for thought: If you have a digital scope, you've removed the requirement to place your eye behind it, which opens up the range of possible positions to shoot from. Does a digital scope that looks like an optical scope even make sense? I'm reminded of early firearms - which looked a lot like...
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