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  1. damoncali

    Do Ballistic Calculators Compensate for Vertical Angle Adjustment?

    Some of the simpler ones assume it to be zero. For relatively flat fire, the difference is insignificant. It does matter for high inclines, though. If you are shooting in those situations, you'll want a calculator that accounts for the angle of fire (or more precisely, the angle of the line of...
  2. damoncali

    Gunsmithing Anybody ever measure barrel droop?

    Length matters a lot. The deflection is proportional to the cube of the length.
  3. damoncali

    A little help spending money!!!

    If you really want to save some cash you can get a cheap wind meter a thermometer and a hand held altimeter for significantly less than a kestrel.
  4. damoncali

    Range Report Problems With Bullet Stability?

    You might be on the edge. An 8 twist is marginal for a DTAC, and cold definitely makes it worse. If it gets bad enough the bullets will tumble. My hunch is that you are correct and that your twist is just a tad slow for what you’re trying to do.
  5. damoncali

    The ColdBore Comparison

    Just human nature I guess. "G7 is likely a little better, the further you depart from short flat based hunting bullets" somehow becomes "OMGOUCANTHITANYTHINGWITHG1!!!" when you add Internet. Where I do have a gripe with G1's are with Sierra. They have some bullets that they report with banded...
  6. damoncali

    The ColdBore Comparison

    "G7 Is better than G1" has been blown way out of proportion and context, especially in the moderate super sonic range. The divergences are in transonic and below (where they both fall apart), and above what we consider normal velocities, where it isn't that important to us. In the range of Mach...
  7. damoncali

    Advancement in Projectiles

    The original Sierra International (MatchKing) 168 in .30 caliber was known for having dynamic stability problems - it's sort of the poster child for the effect. I'm not sure if they've tweaked the design since then, but it doesn't really matter, as 168 grain anything isn't really optimal for a...
  8. damoncali

    The ColdBore Comparison

    Even maintaining a simple iOS/Android app costs a fortune to develop and support, let alone what it costs to integrate other systems. I can't for the life of me understand why anyone would want to sell consumer ballistics software without having some other angle (like selling bullets, rifles...
  9. damoncali

    The ColdBore Comparison

    What's interesting to me is that the differences in results appear to be largely due to poor data on subsonic drag. At the speed of sound, the trajectories diverge dramatically. It's tough to tell without more information, but it looks to me like the curves would match up pretty well if perhaps...
  10. damoncali

    Ballistic Apps - 3DOF, 4DOF, 6DOF

    Trasol/CB does not specify clearly how they calculate last I checked. It is not 6DOF, however. The only commercially available 6DOF calculators that I am aware of are PRODAS (which really isn't even a solver the way most people think of one) and the Lapua app. Maybe there are some others I don't...
  11. damoncali

    Range Report Effects of wind on elevation. Aerodynamic jump/drag

    Unless you're making huge wind call changes (say, your dope is at zero wind and the current wind is 30 mph), you're not going to see it and can safely ignore it. And if you are, you're in all likelihood going to miss and get some new dope. (With some exceptions - like short range/rimfire...
  12. damoncali

    ERL Central vs KO2M

    My thoughts, for what they're worth (not much): There will be multiple formats, I think. just as high power, benchrest, and PRS are appealing for different reasons and to different people, the same will be true of ELR. Range alone doesn't dictate how or why people shoot. There is some interest...
  13. damoncali

    Ballistic Apps - 3DOF, 4DOF, 6DOF

    I don't disagree that accuracy has little to do with software. I was merely stating that what was considered a long shot 20 years ago is routine today - not even "long range". Nobody had much use for a ballistic calculator at all when everything was under 300 yards. Better scopes and bullets...
  14. damoncali

    Ballistic Apps - 3DOF, 4DOF, 6DOF

    I don't think we really disagree. 6DOF requires more data (a lot more) than 4DOF. 4DOF requires significantly more data than 3DOF+ (AB style). 3DOF+ requires just a little more data than plain 3DOF. So *if* 3DOF+ is getting you the same results as 4DOF, then 4DOF is a bad choice. That's all I'm...
  15. damoncali

    Ballistic Apps - 3DOF, 4DOF, 6DOF

    To me, the goal isn't "which solver is more accurate with the the same data", but "which solver provides acceptable results with the easiest to acquire data". Assuming good data, 3DOF < MPM < 6DOF. No arguments there. However, getting data for even 4DOF is non-trivial, and bad data can be worse...
  16. damoncali

    Applied Ballistics Weapons Division

    You're not wrong at all. Form factor (as defined here by AB) is in no way used by a ballistics calculator, user input or otherwise. It's just there as a reference.
  17. damoncali

    Ballistic Apps - 3DOF, 4DOF, 6DOF

    Lapua is a legitimate 6DOF calculator, but that's kind of wasted on a phone. They have not to my knowledge explained where they get the volumes of data required for it (they either calculate the data, or the measure it - each has it's drawbacks). So you just sort of have to trust them that it's...
  18. damoncali

    Range Report Calculating BC with numbers from Labradar

    I don't have a labradar, but I've been wondering if you could use one to quantify lot-to-lot variances in BC. The distance measured is far too short to make accurate BC calculations, but it seems like it *might* be possible to make relative comparisons.
  19. damoncali

    Spin Drift Data

    Yes, you can measure it, but it's a small effect and it's difficult to do. You can use radar data and try to separate out the other effects, which is hard, or you can measure lift in a lab, and try to figure out yaw of repose somehow, which will also get you there. Bottom line: it's real, it's...
  20. damoncali

    Advanced Marksmanship Judging wind.

    Your problem is compounded by shooting in a head wind ( see http://bisonballistics.com/articles/why-headwinds-are-more-difficult-than-crosswinds ). It's a very difficult condition because even small changes in direction have a large impact in wind deflection. It's just hard, but the answer is...
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