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  1. bd73

    Range Report ELD-M 130 gr real BC?

    I did the same yesterday, and my data match a BC at .625, pretty close to yours. Cool to see that you get similar results as we did. Thanks for sharing. And the results as started this post are verified. I still have to set the axial form factor to .9 to get the my dope in the Hornady app.
  2. bd73

    Range Report ELD-M 130 gr real BC?

    DA was 445 meters. Both pressure, humidity and temperature was part of my calculation.
  3. bd73

    Range Report ELD-M 130 gr real BC?

    Looking forward to hear the results of that. You got about the exact same speed as I do. On Saturday I will do a new test out 1315 meters (1440 yards) and I am excited to see if my results from last week will be reproduced.
  4. bd73

    Range Report ELD-M 130 gr real BC?

    What part of the data set are you missing to review my results completely?
  5. bd73

    Range Report ELD-M 130 gr real BC?

    For some reason it didn't work. But I kind of agree. It's possible that the axial form is not the whole X here.
  6. bd73

    Range Report ELD-M 130 gr real BC?

    Thank you for explaining this in a layman's terms.
  7. bd73

    Range Report ELD-M 130 gr real BC?

    I think what your saying is finally starting to sink in. Up today I have thought of the BC as a much more constant variable that it in reality is. Thank you for being patient ?.
  8. bd73

    Range Report ELD-M 130 gr real BC?

    Do you mean that BC is effected by the velocity of the load even when I am within the 2.25 mach? Does that mean that in reality I get a higher BC because of higher velocity than Hornady used when they made their data? Yes he did. That axial form factor seams to be the x in this equation. It...
  9. bd73

    Range Report ELD-M 130 gr real BC?

    If I stay on the speed of 883 mps I get nearly close to your result: That is closer to reality of the dope I observed. Can you explain this axial form factor? I read what was written in the help section but I am still not sure I understand the science behind it.
  10. bd73

    Range Report ELD-M 130 gr real BC?

    Hand loads. 44,9 gr of Reload Swiss RS62 in a Lapua .260 case and Fed 210 GM for ignition. Over four different ten shot series chronographed with LabRadar the average ES and SD was 7,25 and 2,73 (meters per second).
  11. bd73

    Range Report ELD-M 130 gr real BC?

    I don't spot the difference in the input between our different results. The result is reproduced four times. But all four on the same range. So it is possible it is the same type of wind making tricks with the bullets here.
  12. bd73

    Range Report ELD-M 130 gr real BC?

    Yes, the answer could be hidden in what you saying here. I think we got a bit blinded by the high BC number our results produced. It was as high as the ELD-M 140 gr. Of course we did not have the 140 gr bullet to compare the results with - that would have been interesting. I am not an engineer...
  13. bd73

    Range Report ELD-M 130 gr real BC?

    As you see your dope differed from mine and only difference I see is the axial form factor. Why would that be .9? The firing angle was measured with a SIG 2000 to 9 degrees.
  14. bd73

    Range Report ELD-M 130 gr real BC?

    The wind was from ten o'clock. But there could have been winds we did not observe. It was in the evening so it was not much wind at all.
  15. bd73

    Range Report ELD-M 130 gr real BC?

    Here is what I entered in the 4DOF calculator: As you can see my dope had corrected for 9 degrees angle. I know my scope is zeroed at an official range at 100 meters and there is no angle between where I shoot and where I hit. I have not verified the tracking after it was new a year and a...
  16. bd73

    Range Report ELD-M 130 gr real BC?

    We used the mach 2.25 BC of 0.554 G1. And even with that BC we still overperformed the actual BC. I also verified my dope with the Hornady blastic calculator, and it was consistent with the two others I used.
  17. bd73

    Range Report ELD-M 130 gr real BC?

    My initial dope was 9,1 mil. Scope height is 6,14 centimeter (2,48"). And corrected POA with POI I was down to 8,2/8,1 mil. Keeping in mind the impact on ice it was for some shots hard to be 100% sure of where the POI was. So based on that the BC went from about the stated .55 to .62 (G1). I...
  18. bd73

    Range Report ELD-M 130 gr real BC?

    I don't disagree with that viewpoint, so I am trying to figure out if anyone else has similar experience or if both our data and setup is somehow off.
  19. bd73

    Range Report ELD-M 130 gr real BC?

    Tip appreciated. One was 1:8 and the other 1:9. Since both optics were verified at 100 and 300 meters at the same shoot-out we think we have ruled out scope issues. My friend has also previously verified the same deviation at 500 and 800 meters. I agree that 10% off official data seems to...
  20. bd73

    Range Report ELD-M 130 gr real BC?

    A friend and I have shot the ELD-M 130 gr over several occasions and we have experienced that the BC stated by Hornady does not reflect our on results. Our data indicates a BC a lot higher than the official BC. We shot at 975 meters (1066 yards) on ice, so the point of impact was not a hundred...
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