Harmonic Barrel Tuners - Help or Hype?

[okieairgunner]

I have a EC tuner break on my RW I have seen a big difference and help.

 

[caesar]

I use Cortina tuners on my centerfire PRS rifles and they work great. But I never got the integrated FX harmonic tuner to do anything other than move the group around the paper. The groups were always smaller without it, still feel like I did something wrong but I actually found a big heavy moderator helped more than the tuner did.