Harrell tuner for cz 457 mtr.

[hotshot828]

Has anyone used this tuner? Does it eliminate fliers and tighten up groups?

 

[VLNBYR]

The best way to go fast is to buy a fast car. Turning a slow car into a fast car is much more difficult.

 

[MarkS]

They will tighten up groups.

 

[Spyder1958]

Has anyone used this tuner? Does it eliminate fliers and tighten up groups?

Yes, have several on various BR for unlimited class,
Your CZ will not compete very well against unlimited rifles. I’d Keep it in factory class. I have a very fine shooting MTR, it’s bedded, trigger upgraded, and lot tested Midas. It shoots great in factory but will not come close to an unlimited rifle. And no flyers with the right ammo.