I found this tidbit quite interesting. It’s not consistent with my experience.
Chronograph: MagnetoSpeed V3
In addition to the 10 test rounds of each caliber and primer size, I loaded an additional 10 to shoot without the MagnetoSpeed attached. What I found was the MagnetoSpeed shifted the point of impact generally high left .5 – 1.25 MOA but did not affect group size.