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  1. B

    BC Correction

    The '89 does that, very well. IF you order one, specify that you want 5 microphones and no skyscreens. They will understand. I think they are actually calling it "BC in a Bag" when ordered that way. Glad to be of help.
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    BC Correction

    I'll have to go in search of data from the 2 mile testing as it was a while back. We did it two times, once in the '88 days and once in the '89 days (The '89 is what the '88 should have been). The data agreed with onsite radar, once in a simuletaneous test and once in a follow up test, at...
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    BC Correction

    Well, I didn't think about attending a match and shooting over the AB radar. Yep, that would be the best way! I don't have an issue with setting up the downrange gear. I can see where it is a hassle on some ranges. I know of one that it takes 30 minutes to drive to the 1 mile target because...
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    BC Correction

    I know it has been done with a Garmin at 800 meters.
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    BC Correction

    Hardest? Hardly. Shooting past a downrange Garmin is not that difficult. Easy to do at any distance you have confidence in shooting thru about a 10" window. For farther ranges, you could build a steel protective plate with the window built in. You can put a phone downrange and "Facetime"...
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    BC Correction

    Best thing you could do, without spending $150K on a medium range radar system, would be to measure MV and either downrange velocity or time of flight at the farthest distance you plan to shoot. Either of those would give you all the info you'd need to tweak your system to be on everywhere to...
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    Is bullet still stable/accurate after it goes subsonic?

    I suspect the best way to know is to measure the drag consistency. It would make sense to me that If the drag consistency is low in supersonic and also low in subsonic, the bullet would have been stable the whole way.
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    FBI Sniper Rifles

    I pray you are right.
  9. B

    Garmin Xero C1 Pro chronograph

    I saw better agreement when running a Magnetospeed at the same time as a Garmin. Don't know what caused the disagreement in the photos. That can happen with any instrument. It is the reason I run two whenever making important measurements. IF they are in good agreement, everything is...
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    Garmin Xero C1 Pro chronograph

    Skyscreen chronographs measure velocity midway between the "start" and "stop" screens (no offense intended, you probably know this but there may be some readers that don't). I think the start screen was 9.5 feet. I was using a 9 foot spacing so the point the Oehler was measuring velocity would...
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    Garmin Xero C1 Pro chronograph

    Best I can tell, the Garmins do as good a job of measuring muzzle velocity as most anything. I believe they interpolate a MV from measuring in front of the muzzle because they can't measure right at the muzzle. To investigate, I ran a 20 round test on an Oehler 35P with a 9' spacing. That...
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    FBI Sniper Rifles

    Pictures, artwork, etc., that's how some were concealed.
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    FBI Sniper Rifles

    The weapons display was removed a long time before you went thru the Academy. If I had to guess, I'd say about 2,000. That display attracted a lot of attention and many visitors would linger in the gun cleaning room to view it. There were a few NDs in that room and it was decided that...
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    FBI Sniper Rifles

    The rate at which the Possible Club grew declined significantly when the FBI moved from teaching precision shooting to teaching speed shooting. If you want a good idea of how slowly it has filled, go look at the board and find my name, JB BOONE. I shot it in October of 1988.
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    The Wheel of Time

    Time Of Flight is the most important factor in long range accuracy. Drop? TOF based. Wind deflection? TOF based. Shooters think in terms of distance. Ballistic programs convert TOF to distance. One day shooters will seek TOF consistency in the same way they now seek MV consistency.
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    2024 Christmas gift thread (#2)! Please read instructions to participate!

    M40
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    Key holing 6mm creed after barrel cut

    Publishing was encouraged for our Engineering Technician, Ballistics guy: https://www.longrangehunting.com/articles/the-over-rated-crown.670/
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    Which piece of equipment is more important?

    I've seen a few from AB. I got a call from Bryan to let me know his video showed barrel movement. I reminded him that mine did, too. Only the movement is straight to the rear. The dial indicator was to measure vertical, which was not observable prior to bullet exit (I've only ever heard...
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    Which piece of equipment is more important?

    Nope, incorrect. "Reliable" chronographs have been around since the 70s. Perhaps they were not convenient but they were certainly reliable. BTW, you are not the only one to make this error. I've heard two or more, highly respected, people say the same thing.
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    Barrel rifling

    I looked the Shot Marker up and it certainly seems to be a good piece of kit. In the spirit of "Trust but verify", have you ever put a Garmin or other chronograph downrange to verify the Shot Marker is giving a reliable velocity measurement?
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