That barrel is short and stiff enough with a fairly fast burning powder that usually those are the sorta loads that aren’t affected as badly with my Magnetospeed either. My 300 RUM with about the same weight barrel and 4” more of it is quite a bit different in POI.
That's what I've observed as well.
Haven't tried a MS on a .300 magnum of any sort, but have seen at least a couple inches of POI shift at 100 yards, and MUCH larger groups, when a friend of mine used on on a 6.5 Creedmoor sporter.
