The statement above that “there hasn’t been any real science done” caught my eye. If I have overlooked a previous post in this thread about scientific testing of tuners, please pardon me, but there has been a significant amount of scientific work done regarding tuners by Bryan Litz and the team from Applied Ballistics.
Modern Advancements in Long Range Shooting, Volume III, Applied Ballistics LLC, Howard City, MI, 2022
Part I: Precision Testing
Chap. 4: Barrel Tuner Testing, pp. 57-108.
If you comment on this work, please mention in your post whether you read the entire work cited.
I have read it, and I think the work speaks for itself. I won’t spoil the pleasure inquisitive folks would get from reading it.