The MagnetoSpeed chronograph attaches to the muzzle end of the barrel and uses electromagnetic disturbance to accurately measure velocity. It doesn’t require bright light to work effectively.
The MagnetoSpeed chronograph has a bayonet, a display unit and a number of spacers to measure the proper distance from the bore’s centerline axis. It’s very easy to set up and use.
only move a bullet’s impact by about an inch at 350 yards. If you do most of your shooting inside 350 yards, don’t sweat the ES and SD too much. In terms of rife shooting, as much as I want to see low numbers in both of those categories, they really don’t have much infuence until we get out past 500 yards. We’re better served by focusing our effort on fnding what load our rife shoots best (or creating our own) if we do most of our shooting inside 350 yards. For those shooting factory ammo at longer distances, ES and SD have greater signifcance. Knowing this, G&A generally uses only Oehler 35P or MagnetoSpeed chronographs. We fre 10 rounds across the chronograph for each load to collect the ES and SD. We’ve selected these two chronographs for testing purposes because they’re the most accurate when checked against Doppler radar. There are cheaper and/or easier-to-assemble chronographs avail-
All MagnetoSpeed components ft into a small hardcase about the same size as those that are used to ship pistols.
able on the market, but the information they provide isn’t as accurate. If ES and SD matter to you, use either the Oehler or the MagnetoSpeed to generate meaningful data. Three or Five? A sure way to start a fght with rife shooters is to ask how many rounds should be fred for each group. Some say three, some argue for fve, and yet others are adamant that we should all be shooting 10 rounds per group if we’re serious about knowing our rife’s accuracy potential. Ten is ridiculous. The truth is, the rife decides how many rounds it should fre per group. Specifcally, the barrel contour and chambering are what tell us how many rounds the rife wants to fre. Hunting rifes with their light barrel contours should shoot three rounds per group. There just isn’t much steel to mitigate the effects heat has on the barrel once we start