Cortina EC Tuner... They work!!!

[Bigjake83]

Just a quick and dirty review of the Cortina Precision EC Tuner.

I'm running a Custom Seekins Precision SP10 with a 24" Proof Research Carbon fiber Barrel and a American Precision Arms GEN3 Brake Average accuracy I'm seeing is around .70-.75 MOA with any of the Hornady Match box ammo.

Decided to Give the EC Tuner a go and have been thoroughly impressed.


Conducted the standard shoot 3 then move 2-4-6-8... And so on, every load definitely had its own preference, I ran 140 ELD Match/ 147 ELD Match / American Gunner 140.

Once I found each loads preference I shot a 5rd group to confirm, I fucked up and got a couple flyers on the first and the last 5rd group. I'd say the results are pretty clear. I'll up date this once I start handloading.

I think these would shine the most with the loads that have outstanding Muzzle Velocity/ES/ and SD's but the accuracy just isn't there, one of these could make all the difference.

 

[Precision Underground]

Doesn’t this prove the “harmonics are a myth” crowd wrong? Or am I wrong about how this works? Need to know before I talk shit to ppl.

 

[tomme boy]

You are changing the harmonics of the barrel by adjusting the length. That is how this works

 

[acudaowner]

or it could prove he took his time when he shot with it on and did not without it . I'll take it like masks and covid it it makes you feel warm and fuzzy and you got the money then get one by all means . if not then don't wear a mask either way don't worry be happy .

 

[Bigjake83]

or it could prove he took his time when he shot with it on and did not without it . I'll take it like masks and covid it it makes you feel warm and fuzzy and you got the money then get one by all means . if not then don't wear a mask either way don't worry be happy .

I took my time with everyone of those groups, I thought it was going to be just another gimmick as well. Honestly it's just something you have to try out to believe, the damn thing works.

 

[otnot]

My JP was a 3/4 moa gun due mostly to being restricted by magazine length ammo. So I added the EC Tuner/brake and was able to bring the group sizes down to under 1/2 moa. I have put 200 rounds through it now and I have to say that it is repeatable. I think it is a great tool for the AR platform or any gun with a short magazine.

 

[kthomas]

Doesn’t this prove the “harmonics are a myth” crowd wrong? Or am I wrong about how this works? Need to know before I talk shit to ppl.

I don't think anyone disagrees that changing the weight on the end of the barrel changes harmonics.

The interesting conversations occur around if harmonics change the precision of a barrel/rifle, why that is so, and if that's a phenomena that's statistically relevant and repeatable across barrels and platforms.

The data is very clear that barrel harmonics change with a change in weight and other structural factors. What isn't so clear is how those harmonics effect precision, and why.

 

[kthomas]

I took my time with everyone of those groups, I thought it was going to be just another gimmick as well. Honestly it's just something you have to try out to believe, the damn thing works.

I also have a tuner brake, and through my testing I disagree.

But it's a different rifle, different ammo and different shooter.

I shot many 5 round groups, with and without a tuner, to test it out for myself with my most precise rifle. POI shifted slightly, but no real statistically meaningful change in precision.

Personally I find this topic fascinating, ever since our discipline of shooters have recently adopted tuners for a use they were never used for before. My mind is still open, but so far the current data and theory behind it is less than compelling.

 

[Oldmauser]

There is some reliable data for rimfire rifles, but it's not the case for centerfire.

 

[Precision Underground]

I don't think anyone disagrees that changing the weight on the end of the barrel changes harmonics.

The interesting conversations occur around if harmonics change the precision of a barrel/rifle, why that is so, and if that's a phenomena that's statistically relevant and repeatable across barrels and platforms.

The data is very clear that barrel harmonics change with a change in weight and other structural factors. What isn't so clear is how those harmonics effect precision, and why.

Just having a little fun busting the balls of the 1.25” straight taper 6GT crowd out here saying load development is useless and harmonics are a myth!