I started watching , but lost interest when the discussion was about the differences between artillery shells effectively laying in the bottom of the bore and cartridge based bullets being held in the bore by the cartridge case. Then all the talk of computer modelling etc down to the point of accounting for jacket wear in the course of the bullets travel in the barrel. Too much deviation from the central point of the subject for me.
In the real world I first tried a tuner having found that on a new barrel putting a magnetospeed on halved the group size, had one of the early Cortina tuners fitted to the barrel and undoubtedly it made a difference , in terms of group size, shape of group and poi.
Not had a barrel since that produced such repeatable results as that first try. But as i’ve got them i don’t see any harm in fitting them and generally they do alter poi and group size to a degree. But they don’t improve an already good load. As for moving it outside of a load development session , i’d have no idea which way to go during a comp.
Being totally unscientific and based solely on my experiences, the tuners effect seemed much greater on a 7/270 and a straight 284. On the 300wsm not so much. ( until the day i shot a detail with the tuner loose and had no understanding of what was going on till i discovered it after).
Of those that listened to the whole video, would I be right in thinking they were leading upto the conclusion that a decent barrel, good components, well developed load and carefully produced ammo were far more important factors than the tuner, which wouldn’t be able to cope with variances in ammo anyway?