dodgefan - Reading the messages at the site you linked to I see near the end of the thread that several people were having issues detecting some kinds of bullets with the magnetospeed even after fiddling with some triggering settings. Some were finding that monolithic, lead, and thin metal jacketed bullets are hard if not impossible to detect.
I think the verdict is not final on the effect magnetospeed has on group size. In order to believe it has little effect means believing that decades of shooters experience with harmonic tuners and dampers is all nonsense and those in the accurizing business have been selling snake oil.
