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  1. L

    Labrabaco: a G7 BC calculator from Labradar tracks

    Not really "strong claims" just real world data and how this works. LabRadar is, if everything goes well, capable up to 200 yards (give or take, to take downrange readings, given angle, projectile size, etc.) Thus and among other things it's not realistic to derive a BC based on such short...
  2. L

    Labrabaco: a G7 BC calculator from Labradar tracks

    My suggestion is to read the paper "Accurate Measurements of Free Flight Drag Coefficients with Amateur Doppler Radar" by Michael Courtney, there is a good deal of technical aspects discussed. The math is non existent unfortunately. https://arxiv.org/ftp/arxiv/papers/1608/1608.06500.pdf
  3. L

    Labrabaco: a G7 BC calculator from Labradar tracks

    Comparing Hornady's Doppler (a real pro radar) to whatever LabRadar says is ...well...close to absurd. So, those so called "differences" means nothing unless the distances are known, conditions, etc. (Wind is critical) You can apply whatever curve fitting algo you want, but in the best case...
  4. L

    Question about BC calcs

    Can't help with the math, but Patagonia´s ColdBore has a BC section where the BCs are "normalized"
  5. L

    Switch Barrel Gun

    My switch setup is a DT SRS A1 in 33XC and 37XC. Sweet!
  6. L

    a geek’s delight: reverse engineer a distance-velocity table to Cd/Mach curve

    And what about the signal strength? If the C1 can pick up readings no farther than 100 or even 200 yards then it's basically useless for real BC work. Same goes for the LabRadar. Picking up a small projectile is very hard even to most professional Doppler radars, just check Hornady or AB tests...
  7. L

    Looks officially out, the Vortex Impact 4000 WMLRF

    Interesting. I guess there are some cumulative differences, worth taking a deeper look into this. Thanks for posting
  8. L

    Looks officially out, the Vortex Impact 4000 WMLRF

    Can you run the same BC / MV data without WIND? (zero speed)
  9. L

    Looks officially out, the Vortex Impact 4000 WMLRF

    A simple and fair comparison between AB and JBM (essentially the same for GEO and many others). If some can see any significant difference, don't hold back and tell us :cool: Cal 0.308 BC-G1 0.5 MV 3000 fps Temp 59°F Stat 29.92 Hum 0% ZR 100 yards SH 2.0 inches Wvel 10 mph...
  10. L

    Looks officially out, the Vortex Impact 4000 WMLRF

    "the hours and time spent perfecting their AB modeling" your words...not mine. Now, let's make this simple. Post the exact input and let's talk about any significant differences, if any. I've said this several times before...AB, GB and JBM all run the SAME calculation method, meaning the outputs...
  11. L

    Looks officially out, the Vortex Impact 4000 WMLRF

    If I understood right, you haven' been comparing apples to apples, because you compared a highly tuned AB solution vs. the UNtuned outputs of the other packages. Clearly not fair. If you really want to be objective, try a side-by-side comparison with same inputs from scratch, NO tuning. On the...
  12. L

    Looks officially out, the Vortex Impact 4000 WMLRF

    JBM, GEO and AB are essentially the same ballistics engine, the differences are moot, being all based on the same Point Mass method, which is very simple. Your right, AB add a premium which is hard to justify when compared to the other software.
  13. L

    Looks officially out, the Vortex Impact 4000 WMLRF

    No, it does not. The military scope by Vortex runs on a government-provided software.
  14. L

    Strelok Pro

    You say they stole from you the actual code or that they developed a similar program? Can you prove such a claim? Don't have a dog in this fight just out of curiosity.
  15. L

    Sako TRG22A1 6.5CM

    What rings (and height) go along so well with the S&B 5-20?
  16. L

    Why DA isnt Better than Pressure, temp and humidity in BC's

    Minuscule or not, it should be factored in for a complete DA solution. Most specially at ELR. Anyway, for medium range work it doesn't matter like you said.
  17. L

    Why DA isnt Better than Pressure, temp and humidity in BC's

    Makes sense only as a practical handy way, because you enter just one value, meaning less chance of input errors, other than that it all comes to a personal preference.
  18. L

    Why DA isnt Better than Pressure, temp and humidity in BC's

    I'd say that if you run any Point-Mass based software the above is true, but it's not a general truth. A couple of things are in order to understand why the above is a stretch. a) Point Mass depends on the Mach number which in turn depends on Temp b) If you resort to a simplified equation to...
  19. L

    416/458 Vestal

    Their website is up and running. https://www.rccbrass.com/
  20. L

    Strelok Pro

    Just distribute it from any of the many stores available. Sure you are already thinking about this.
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