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  1. J

    25 creed vs the others

    Nah. :D C&C bullets (which includes almost all match bullets), generally have very reliable terminal performance when impacting between approximately 1800-2700 fps. By starting a 147 ELD at 2700, terminal performance is predictable and dependable from the muzzle out to the distance at which...
  2. J

    impact velocity better or worse?

    Each model of bullet behaves a bit differently when it come to minimum impact speed to initiate expansion. If you want to build some confidence in the bullet you're interested in, shoot it at distance into dry newspaper and see where it stop expanding properly. Newspaper isn't a perfect...
  3. J

    25 creed vs the others

    Sort of. Approximating a bullet as a cylinder, volume (and by extension, weight) vary linearly with length and quadratically with radius. Your point remains, however, that small changes in diameter result in a proportional squared change in volume.
  4. J

    WTS Borah bivy

    What model? Pics?
  5. J

    Training Drills for NRL Hunter and Hunting

    In general, I try to train in more challenging conditions than I’ll compete or hunt in.
  6. J

    7mm 160 TMK experiences

    Yup, I think you're right about that. I agree that it's probably an approximation for simplicity. And it appears to only be the case in external ballistics. Seems as though it's defined properly in terminal ballistics and medical ballistics. Interesting discussion on the topic here...
  7. J

    7mm 160 TMK experiences

    Yup, exactly. I missed the pi. That's an oversight on the Wikipedia BC page. If you go to the SD page, it's defined properly. https://en.wikipedia.org/wiki/Sectional_density#:~:text=Sectional%20density%20(often%20abbreviated%20SD,overcome%20resistance%20along%20that%20axis. EDIT: it seems to...
  8. J

    7mm 160 TMK experiences

    Ah, I see what you're trying to do. Makes sense. The only thing I'll add is that there is a missing pre-factor of "4/pi" in the numerator on the right side of the equation. So it becomes BC/m = 4/(i*pi*d^2)
  9. J

    7mm 160 TMK experiences

    That's not quite right. Trajectory depends on the bullet's BC, which depends, in part, on the bullet's form factor, but also on its SD. The proportionality constant for both form factor and SD is 1 (an equal dependence on both).
  10. J

    Tikka 223 trainer

    You’ll have to get out your Dremel to open the inlet, but the last few years I’ve been pretty happy with Atlasworx BM with the trigger guard mag release upgrade.
  11. J

    Tikka 223 trainer

    The only weakness of the Tikka T3x in .223 is the mags. Replace the BM or go chassis so you can run AICS mags. Of course, the CTR in .223 comes with great mags.
  12. J

    Hanging Gongs

    We've had several cease fires during matches due to the t-posts getting cut down by low shots. I think they do take a number of hits before getting cut in two, though. After the matches, the posts look like they've been through WWII, haha.
  13. J

    Hanging Gongs

    The bigger issue is that low shots tend to cut the t-post down.
  14. J

    Accuracy of LabRadar downrange velocities?

    I wrote some Python code to analyze drag coefficients and BC values based on LR velocity measurements, and here's some select data points measured at 0.66 RH, 8.3 deg C, 26.2400001142 InHg. Keep in mind that measurements taken over shorter distance are less reliable, and Hornady's published...
  15. J

    Accuracy of LabRadar downrange velocities?

    I've spent some time measuring BC values using the LR. I would suggest you measure more than one sample (assuming that's what you did with the 108 ELD-M). A sample size of 10 is much better, and 30 is getting fairly reliable. Carefully adjusting the parameter settings and aiming the LR will...
  16. J

    quick drop

    This. The physical models are similar, so if you're getting large discrepancies between apps, it's almost always because you've got one or more mistakes or oversights in your parameter inputs.
  17. J

    Hanging Gongs

    T-posts with associated hangers is the plate hanging system that goes down by far the most often in the precision and practical rifle matches I shoot.
  18. J

    Different suppressors = different groupings?

    This. Changing the weight, and even the distribution of that weight, will certainly change barrel harmonics, which can change POI and precision.
  19. J

    Scope Zero Check Thread

    Have you checked for parallax in both positions?
  20. J

    Custom Tikka 7PRC Build

    A 7-08 isn't getting just under 2800 fps with a 180 gr bullet from a 20" barrel.

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