Ok, I'm trying to put this in usable terma for me.. All material, barrels pipe etc have a natural point where the natural freguency can be set of, at that point the item vibrates like a tuning fork. From what I know you are trying to get at the right point on the sign wave so you don't increase the effect. But to change the harmonics (natural frequency) you either have to stiffen or add mass, to change this, Period, unless you change the the load for the paticlular rifle, then this all changes, again, and that point at which you refer to as sweet ain't sweet no more. That why when or if you glass the barrel in the forarm it added mass and stiffened) and changed thesign wave raised the natural freg. All of this is of no help if you find the correct load and combination of bullet and powder, That is what people have been doing by changeing their loads (tuning the rifle to load)till they find one that works. But you can't shoot all bullets and loads by finding this spot. If so please send info to qualify data.How did the 45 90 go. This natural freq is why the longer barrels and heavier loads are hard to tune, either the barrel needs to be shorter or heavier and it would easier to tune loads.. Maybe, vibration has been used for years and is now being applied to rifles and its impact so time will tell..I read the other site, lots of high tech, but practical will be better.. Thanks for the info gave me more to think about Loco