Used on a 22in 6.5 heavy/ hybrid barrel from critereon.
I didn’t see a lot of variation in group sizes testing at 0-2-4-6-8-10-12-14-16 settings. I did get one three round group where all three shots shared the same hole in a clover pattern, about 1/4moa, but wasn’t able to replicate that result. Most follow up groups were between 1/2 and 1 MOA. So consistency is yet to be determined.Technical questions asked through the EC precision website have not been answered however I’ve figured the answers out without the response. Perhaps my questions were dumb ones.
One interesting thing- I have a fairly light trigger on an AR10 platform and a not very deliberate trigger pull fired a very rapid follow on shot due to the trigger reset and pull during recoil- there was no muzzle jump between the shots and the POI of the second un aimed at unintentional shot was within a half inch of the first- This is a testament to the brake effect and a lesson to me about being more deliberate. Testing and zero was done at 100 yds with Hornady match factory ammunition 140gr.

This thing works like magic. I was having trouble getting a new Christensen rifle to group like I thought it should. Put this thing on, tried a couple of settings and quickly got a 4-shot group to group at .75 MOA at 100 yards. I have ordered 4 more for some of my other "problem children".

the brake mounted easily, tuned with three shot groups and it did its magic. It gave me sub-MOA point of impact with factory loads.
Great product does what it advertises.

I think this is the best one on the market. Break is better than the one that came on my R P R 6.5 Creedmoor. Than add the ability to tune your rifle to your load your using, Wow. In my opinion it’s a must have!