I have the Lab radar, ohler 35P, two different Chrony's.
You will be hard pressed to beat an Ohler 35P. I shoot several barrel tuners, and if you attach anything to your barrel, it will change the harmonics. Very, very small changes in the tuner will change a load. So, I am very skeptical of a Magnetospeed, but my fears may be unfounded.
I've seen the Magnetospeed significantly affect POI for two 5R Milspec Remingtons, one 308 and one 300 Win magnum. (Varmint contour barrels for those who don't know that model.) It markedly affected group size for some factory ammo the 300 mag shooter was testing at the time.
