IMO, a tuner on anything but a Browning, as a BOSS, is merely a gimmick or an experiment.
Yes, you can put an adjustable muzzle device on any gun, and affect your grouping.
But without understanding/testing there is no reason to hope this amounts to 'tuning'.
Browning has done this testing, and if memory serves me right, they promote an annual BOSS challenge tournament.
The point blank BR crowd has found with THEIR tuners on their extremely limited guns, that tuners do not achieve the tune they normally have. ie. It doesn't affect the load they would use otherwise. Tuners for them have neither hurt performance nor helped, other than allowing abstract adjustments for atmospheric changes. You could probably do as much to a standard load with a few wraps of electric tape..
This is because they are trying to reinvent a
with zero understanding, and no scientific method.
Even the rimfire crowd, who need adjustment more than anyone, have failed to define a predictable system of muzzle device tuning.
Browning is the only company to produce success here in that you can pick a load, and dial BOSS in to reasonable factory accuracy with it. This with a fairly wide variety in cartridges(not just one).
I have an A-Bolt that came with BOSS originally and shot very well(223). I changed the stock to one of their Eclipse thumbholes and then had no luck dialing a tune. I didn't know about Flexane, but recognized that the original plastic stock had a hard rubber bedding. So with nothing to loose I bedded the Eclipse with ShooGoo(close match). From this point, I could dial in tune without issue, and the gun was even more accurate than original. I've since come to believe that nothing else could have made that barrel shoot so well.
A few years later I damaged the barrel/BOSS in an accident, and rebarreled with a Pacnor in 6br(no tuner). Same bedding, but this combination will not shoot as good as the original with BOSS.
If I were to build a tuned gun today, I would use Browning's own non-muzzlebrake tuner on a lightweight contour, epoxy bed the pillars, and Flexane bed the action/barrel shank.
Just a matter of finding a machinist that could finish the muzzle end for it. Or, if someone made an alternative to Browning's tuner that was as good, I might go with theirs. Haven't seen that yet.