Very accurate and, but pushes POI a lot!
I've been wanting a Magnetospeed since they came out. I love the idea of not having to go forward of the firing line at a range, not having to worry about how low in the sky the sun is (I've missed many shots on my optical chrono late in the afternoon/evening), and not having to mess with a tripod and going back and forth to make sure I have a chrono set up properly. The Magnetospeed delivers in all these areas! It is also extremely accurate, based on bullet drops. The lower-priced Sported model is what pushed me over the edge to buy. The feature set is reduced vs the V3, but it still does what I want. The one thing I was concerned about was the possibility of the barrel-mounted device adversely affecting how my rifles shoot. Various online forums suggested a small POI change, and little or no adverse impact on group size. I would characterize my experience somewhat differently. The first rifle I tested the unit on was a Ruger Hawkeye Predator in 6.5 Creedmoor. This is a very precise rifle, showing me ~1/2-MOA 3-shot groups with loads or ammo it likes. POI change on this rifle was 2.8 mils! I did not shoot enough to say with certainty whether group sizes were significantly changed or not. Next, I put it on a Browning BLR. This rifle's scope is regulated in minutes, and its POI moved 9 minutes. The M1's POI only moved roughly 4 minutes, so it was still on-target, but that's still quite a move, as far as I'm concerned. The other two rifles were off-target completely. My 204 was pushed off-target, too, but I did not dial the scope to see how far. I also have a heavy-barreled 308 autoloader, and its POI moved only a couple MOA. That's tolerable, but with only a few shots I can't report whether the larger group was due to the chrono or not. In summary, this is a great chronograph for accuracy and convenience of setup. However, at least with hunting-type rifles, one cannot do load development or sight-in work with the chrono mounted. Sadly, this is a significant obstacle for me, so I think I will have to go back to an optical chrono.
