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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Labradar Testing
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<blockquote data-quote="BryanLitz" data-source="post: 1074383" data-attributes="member: 7848"><p>More testing today; pristine conditions this time.</p><p></p><p>In summary, I saw the same exceptional accuracy and precision compared to the 12' Oehler for .308. Error between the Labradar and 12' Oehler* was between 0 and -3 fps for 9/10 shots; one shot had a -5 fps error.</p><p>* data for 12' Oehler was corrected for velocity lost from muzzle to chrono center.</p><p></p><p>So for the 10-shot string with .308, the average MV measured by the Labradar was 2 fps slower than the Oehler, and the standard deviations were 6.6 for the Oehler and 7.6 for the Labradar. </p><p>This is the same exceptional performance that I saw with this unit in the initial test in the rain.</p><p></p><p>Now to see if the smaller 223 Remington shooting 55 grain FMJ's at ~3500 fps would work better in clear conditions.</p><p></p><p>same set up, same result. Most shots didn't read, of those that did read, most were several 100 fps slow. Only 3 out of 14 shots had results that were anywhere in the ballpark.</p><p>Thinking that my set up (with the big Oehler in front of the rifle) may be interfering with the Labradar's view, I moved the Oehler out of the way and got the same result. Most shots triggered but didn't track or gave bad numbers.</p><p>Finally, I moved completely outside to eliminate any possible interference with anything in the shooting bay. Same result. Even with wide open space, the unit just doesn't seem to be capable of tracking the .223. The behavior was exactly the same as it was in the rain.</p><p></p><p>To test something 'in-between' .308 and .223, I set up a .260 shooting 130 gr bullets. These results were similar to the .308; extreme accuracy and precision compared to the 12' Oehler. For 10 shots with the 260, the shot-to-shot variation in readings ranged from -4 to +3 fps, and there was less than 1 fps difference in the average! Outstanding performance in this case.</p><p></p><p>I was out of time after the .260, but I plan to test further to see where the unit begins to have problems between .260 and .223. Hopefully it works for 6mm. Not sure if the magnitude of the velocity is a factor or just caliber. My understanding of Doppler is that higher velocities should be 'easier' to track so it may just be a caliber limitation. We'll see; this is why we test.</p><p></p><p>Oh, and this thing definitely likes to eat batteries! After only a few shots into the testing today the unit started giving up and complaining about low batteries. It's very good that it has a battery level indicator, and lets you know when the juice is running out. Replacing with fresh batteries didn't seem to affect accuracy or precision so that's a good thing. It eats batteries, but the unit is designed well so you can manage it.</p><p></p><p>My next test will be with 6mm. Hopefully the small caliber issues can be addressed with a firmware upgrade and the problem isn't a hardware/sensor limitation.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 1074383, member: 7848"] More testing today; pristine conditions this time. In summary, I saw the same exceptional accuracy and precision compared to the 12' Oehler for .308. Error between the Labradar and 12' Oehler* was between 0 and -3 fps for 9/10 shots; one shot had a -5 fps error. * data for 12' Oehler was corrected for velocity lost from muzzle to chrono center. So for the 10-shot string with .308, the average MV measured by the Labradar was 2 fps slower than the Oehler, and the standard deviations were 6.6 for the Oehler and 7.6 for the Labradar. This is the same exceptional performance that I saw with this unit in the initial test in the rain. Now to see if the smaller 223 Remington shooting 55 grain FMJ's at ~3500 fps would work better in clear conditions. same set up, same result. Most shots didn't read, of those that did read, most were several 100 fps slow. Only 3 out of 14 shots had results that were anywhere in the ballpark. Thinking that my set up (with the big Oehler in front of the rifle) may be interfering with the Labradar's view, I moved the Oehler out of the way and got the same result. Most shots triggered but didn't track or gave bad numbers. Finally, I moved completely outside to eliminate any possible interference with anything in the shooting bay. Same result. Even with wide open space, the unit just doesn't seem to be capable of tracking the .223. The behavior was exactly the same as it was in the rain. To test something 'in-between' .308 and .223, I set up a .260 shooting 130 gr bullets. These results were similar to the .308; extreme accuracy and precision compared to the 12' Oehler. For 10 shots with the 260, the shot-to-shot variation in readings ranged from -4 to +3 fps, and there was less than 1 fps difference in the average! Outstanding performance in this case. I was out of time after the .260, but I plan to test further to see where the unit begins to have problems between .260 and .223. Hopefully it works for 6mm. Not sure if the magnitude of the velocity is a factor or just caliber. My understanding of Doppler is that higher velocities should be 'easier' to track so it may just be a caliber limitation. We'll see; this is why we test. Oh, and this thing definitely likes to eat batteries! After only a few shots into the testing today the unit started giving up and complaining about low batteries. It's very good that it has a battery level indicator, and lets you know when the juice is running out. Replacing with fresh batteries didn't seem to affect accuracy or precision so that's a good thing. It eats batteries, but the unit is designed well so you can manage it. My next test will be with 6mm. Hopefully the small caliber issues can be addressed with a firmware upgrade and the problem isn't a hardware/sensor limitation. -Bryan [/QUOTE]
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