I have them on my bench rest .22lr rifles. they do work. now the reason behind how or why they work started a heated thread years ago. there are several ways to tune one as well. most agreed using three different speeds of ammo say like 1040fps,1060 and 1080 and tune till they all shot into one hole. it can and has been done for years. by tuning like that and testing ammo by lots, you will find more lots of ammo your rifle will shoot better.

I saw some people using a threaded barrel tuner on centerfires years ago. it was much different from the BOSS system. they said it did work for their hand loads just like it does for rimfires.

will it catch on? I bet money let one shooter tape a red feather to his barrel and have a winning season and others will be doing it next year! the rage would be color and thickness of the tape used!!! really, let one shooter have a winning year using a barrel tuner and you will start seeing more of them on centerfire rifles. that would be all it would take.