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  1. B

    Barrel rifling

    Drag consistency has been discussed more in recent months than I can recall in many years. The average consumer now has the ability to actually measure it without "breaking the bank". Two Garmins will give you a MV and a downrange velocity. Hard part is shooting within the appropriate place...
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    Garmin xero or ab mobile wrong?

    I've never found a radar measured drag function done by a competent source to be "Goofy". They offer the most accurate description of drag available - but for the "system" (rifle and bullets) that was actually shot over the radar. Shoot the same bullets in a different barrel and your results...
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    Measuring the velocity of the bullet a target distance

    I should have specified that I meant very few 10 second radar tracks in the civilian world. I get that there are military (therefore Government) entities that have long range radar systems. Most of the radar data available to civilians, for civilian bullets, were done by private entities.
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    Measuring the velocity of the bullet a target distance

    There are few, very few radar measurements of 10 seconds. That takes a multi-head, tracking system. Likely only possessed by government labs. The 10 second limit was set to give "room to grow". When testing into subsonic with the System '89 a target has to be impacted to trigger the...
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    Measuring the velocity of the bullet a target distance

    Unless you are planning on using that data to shoot at a distance where you'll have a TOF of 10 seconds :). I used that example simply to show that, no matter what capability is offered, someone will ask for more. The best use of deriving a single BC from TOF would be on a radar measured drag...
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    Measuring the velocity of the bullet a target distance

    Yes, kind of. The '89 measures time of flight (TOF) and will report BC in multiple drag functions. Some target configurations report velocity at the target but it is a calculated velocity based on a measured TOF and the drag function you chose. Changing drag functions can (usually will)...
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    Measuring BC - Oehler '89

    Both MV ES and drag (BC) ES contribute to vertical dispersion. Most shooters have not had an affordable method of measuring drag ES. The '89 changed that though you had to use skyscreens and a long spacing. Now you can ditch the skyscreens and get data with the same level of confidence but...
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    Measuring BC - Oehler '89

    Plug the mic into slot A. Position the mic in line with and pointing at the muzzle. Distance will depend on what you are shooting. For a pellet rifle, I put it within 2". For non-suppressed centerfire, I verified it worked 24" away. Would probably work farther but don't see need for that...
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    FBI Sniper Rifles

    I'm enjoying retirement and still doing some work in ballstics but try, real hard, not to step on the toes of those that run my old program. They deserve nothing but guidance and support. Besides, they are pretty smart and have made great changes. I'm of the camp that "If the guy that...
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    Measuring BC - Oehler '89

    The Oehler '89 software has been modified to allow manual input of muzzle velocity. The update was released yesterday. SKYSCREENS no longer necessary (will still work with them, though). What does that mean? Alignment issues are over. Don't have to go in front of the firing line to setup...
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    Drag Variability Reduction Technology

    Shot to shot drag variability was being discussed by serious LR shooters many years ago. I think Bryan Litz even mentions it in the 2nd edition of Applied Ballistics for Long-Range Shooting (Copyright 2011). The reason very few paid attention was (my opinion) the difficulty in measuring it...
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    FX Ballistics Chronograph

    I was intrigued by the FX, particularly the claimed ability to read to 300 yds. I emailed the company, called the company, etc. Couldn't get a response. A friend had an associate shooter that bought one. He asked my friend to test it beside his Oehler '89 and his Garmins. Looks like it...
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    Bulletseeker Mach 4 doppler chrono

    Green = >100 Orange = 50-99 Red = <50
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    Measuring BC - Oehler '89

    The latest update to the Hornady 4DOF program includes reporting time of flight to 5 decimal places. If you have an '89 (or other way to measure time of flight), you can adjust the AFF in the program to make the prediction a best fit to your measured time of flight. Time of flight is not...
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    Oehler 35P still being sold

    With the 35P you have the inconvenience of having to setup skyscreens. However, you have the following advantages: 1 - You know exactly where the velocity measurement was made - Easy to get true MV. 2 - You control the accuracy of the system - Want better data, use longer screen spacing (but...
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    Bulletseeker Mach 4 doppler chrono

    They have an ios app update available on Testflight. I've heard it should be in the app store soon. It gives a color representation for number of detections (quality of reading) and makes export easier. Also changed display to read in whole numbers instead of .x
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    Measuring BC - Oehler '89

    I've recently heard from another purchaser of an '89 system. I know the first batch was sold out so looks like they are now shipping again. There is lots to be learned from this technology and I encourage any users that might have questions to reach out to me if you have questions about setup...
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    Measuring BC - Oehler '89

    Using an '89 to measure Launch Dynamics? Something I'd not thought about doing. It will be interesting to follow your results. I've said it before, the '89 will provide some answers but using it will probably create more questions. Thanks for sharing your test results.
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    Bulletseeker Mach 4 doppler chrono

    Received from the Bulletseeker people: I have good news….. the iOS app is live on the APP store with APPLE 🥳 So we are celebrating and offering 100€ off until October 31 🎃 Detail on the website and Facebook. Code: APPLE100
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    Measuring BC - Oehler '89

    That is great to hear, Tim. Thanks for the detailed explanation. I've long believed in the technology. During the early testing, I once loaded a bunch of bullets backwards (to have as much drag as possible) and measured the BC at 500-without sighting rifle in, I just used holds. About a...
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