MagnetoSpeed Chronograph

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posted on August 7, 2015
magneto.jpg
Here at NRA, we’re fortunate to have a dedicated test range and Oehler chronograph. On the occasion when we need to cart a portable chrony to the field, we do it the same as everyone else: Set-up the screens; deal with a wobbly tripod; hope the light is adequate and try not to shoot a screen.

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At 30K frames per second, the image is blurred, but illustrates the unique concept of a chronograph designed around magnetic sensors.
The folks at MagnetoSpeed (MS) in Austin, TX, have built a better mousetrap. As shown above, there are no screens, tripods or even light required because the unit is measuring magnetic pulses rather than shadows cast with lights and measured with optical sensors. Our first question was: “How to avoid shooting the sensor?” That was easily solved with the included ¼ inch alignment rod and spacers that ensure proper clearances. Thanks to an intuitive design, there’s not much of a learning curve with the MS chronograph. The display has been logically programmed to list high and low velocities; mean, extreme spread and deviation values. The battery-powered display runs for 30-100 hours depending on use of the backlight. The archived results can be reviewed on the display or transported to a laptop with the included microSD card. After a review of the one-page quick-start guide, we were able to toggle between easy-to-understand screens that automatically “wake-up” when the retractable data cable is inserted.

This technology requires choosing a bullet type and density. MS makes this easy by using plain-English descriptions such as the default setting of “Copper+Lead (.223 - .458 CAL.)” or “.22/Shot/Slug (Lead or thin copper plating).” We tested the MS concurrently with our Oehler Model 36 chronograph while shooting Atlanta Arms & Ammo match .223/77grain groups from an NM Armalite M15A2 and found the results to be very close. The MS consistently clocked the Sierra boat tail at an average 24.3 FPS faster, which makes sense since the measurements are taken right at the muzzle instead of 15 feet down range as with the Oehler.

The current configuration won’t work with a bow or semi-auto pistols that tip the barrel each cycle. Otherwise, our V2 model (the V1 was released in 2011) worked flawlessly. The new V3 model was released just after our test and includes an improved, smaller display with a 9-volt or two CR123 batteries instead of four AAAs, updatable firmware, a rapid-fire mode and enhanced operation for airguns and shotguns, for an MSRP of $399 through MidwayUSA and others. V3 components are backwardly compatible with V1 and V2 models, and all units come with a 2-year warranty. Units purchased directly from the manufacturer also carry a 30-day money-back guarantee. Watch for a $200 Sporter model (small, simple display) this summer. For more information, go to: www.magnetospeed.com.

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