[ I do not mind POI shift, but I do like to shoot over a chronograph while working up loads. In your experience would you say the Magnetospeed will negatively affect group size? It seems to me if one is careful to not shift the unit on the barrel group size will be unaffected. Or does it mess so badly with the barrel harminics that it actually may? Would be interesting to knw if anybody has done a test with a "proven performer" in a particular rifle, then hung a Magnetospeed on the end and see if group size changes.
I have seen a Magnetospeed mounted on the barrel affect group size many times, sometimes drastically. It affects lighter-weight barrels more, but have seen it happen in barrels as large as .7 inch at the muzzle.
