Q: I notice in your rifle reviews you use a MagnetoSpeed chronograph, which attaches to the muzzle of the rifle and reads true muzzle velocity rather than the velocity three or four metres downrange like the Chrony and other chronographs do. Can you explain how the MagnetoSpeed works?
– Ross Bailey
A: The MagnetoSpeed is very compact and attaches to the muzzle of your rifle. It doesn’t need skyscreens with light diffusers, nor a tripod, which makes it simple to set up.
It attaches to the barrel of the rifle via web strapping and uses electromagnet sensors instead of optical sensors to detect the passing of a projectile.
It measures speed by detecting disturbances in two magnetic fields situated fore and aft in the sensor deck as the bullet passes over it. The sensors aren’t affected by the heaviest muzzle blast.
The unit comes with a full set of spacers to fit any barrel size – light and heavy (slim and fat) barrels.
The display computer attaches to the bayonet via a common 3.5mm data cable. It will archive shot series, and recorded strings may be saved to a micro SD card via an included slot and micro card housing.
MagnetoSpeed allows you to test accuracy and chronograph your loads at the same time.
However, I’d advise removing it when sighting in as the point of impact may be affected by the weight of the unit hanging on the end of your rifle. With it attached to the barrel of my 7mm Harvey Magnum, the rifle throws ’em all over the place.
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