In rimfire, I think they call that, Sporter Class.

True story.
They aren't allowed tuners, so they have devised barrel contours that place weight at the muzzle and backbore/machine to tune. Of course, they don't have the luxury of loading their own ammo. Instead, they test and test different lots until they find a good lot of Tenex or similar, that works with their set tune...then test some more, for another lot number for when the first lot goes out of tune...many carrying two or more lots of tested ammo to the bench.
The only difference I can see in this and adding or reducing powder charge in centerfire..is that adding or reducing powder charge is easier and more predictable.
Both methods can and do work. In the case of sporter class in rf, they have the benefit of a mass at the end of the barrel similar to a tuner..it just doesn't move but does give the benefit of a wider tune window..as does any mass at the end of the barrel. The problem comes when..not if, the tune for the day changes. Having an adjustable tuner gives one the ability to keep a single load, or a single lot of ammo in tune with just a small nudge of that dog knot on the end of your gun. HUGE!!!