Federal New Cartridge

Dos XX

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Dec 29, 2018
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937
This is a tuner test. Same load and rifle
The only thing changed between targets is moving the tuner one notch.

What is happening to the barrel when the tuner gets moved?

This is not my test.

Barrel Harmonic Sine Wave-Tuner Settings by gunsandgunsmithing.jpg
 

BBob

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Jun 29, 2020
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Southern AZ
That for sure is waaaay to small of group size to tell anything.

Also disagrees with other very thorough studies on this subject.

With a short range BR rifle the sine wave that follows the change in the tuner setting is repeatable every time. I think the point Dos XX was trying to make is there is something going on with barrel harmonics.
 

Dos XX

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Dec 29, 2018
Messages
937
Yes I am
With a short range BR rifle the sine wave that follows the change in the tuner setting is repeatable every time. I think the point Dos XX was trying to make is there is something going on with barrel harmonics.

Yes. The barrel harmonic change is making the bullet poi change without changing the load / velocity.
 

BBob

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With a short range BR rifle the sine wave that follows the change in the tuner setting is repeatable every time. I think the point Dos XX was trying to make is there is something going on with barrel harmonics.
Yes. The barrel harmonic change is making the bullet poi change without changing the load / velocity.
I’ll add that the group sizes also seem to repeatedly follow the change in tuner settings.
 

Sundodger

Lil-Rokslider
Joined
May 7, 2013
Messages
225
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Washington
That's the best sounding theory so far I think. I'll have to go find it and see what they're saying.
That would only decrease the dispersion if the wider muzzle velocity range is linked to the wider bullet drag range somehow, which I guess could be possible. Otherwise if they are not linked, then it should increase dispersion.


In engineering we call this the virtual condition.
 

Bluefish

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Jan 5, 2023
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That would only decrease the dispersion if the wider muzzle velocity range is linked to the wider bullet drag range somehow, which I guess could be possible. Otherwise if they are not linked, then it should increase dispersion.


In engineering we call this the virtual condition.
Agree. Just threw it out there as a possible reason for people observing that the variability in speed is not showing up on target. Unfortunately researching it needs a Doppler radar, so any research would be limited to the manufacturers. It would be interesting to see if a BC SD and ES can be calculated.

In a perfect system, speed variation is low, bullet drag variation is low, dispersion from the rifle is low.
 

wind gypsy

"DADDY"
Joined
Dec 30, 2014
Messages
10,095
My favorite thing about the gun community. Everyone screams for innovation but when companies innovate the idea gets poo-poohed before it even hits the market.

Yeah, its an odd phenomenon. Whining every year about how nothing new or unique ever gets introduced around shot show timing but shitting on anything unique that does get released.
 

solarshooter

Lil-Rokslider
Joined
Jan 17, 2023
Messages
249
Location
WA
I for one support the innovative move. I have some questions about some of the marketing claims but I'm eager to see how they bear out in testing. Positive response from me!
 

wnelson14

WKR
Joined
Dec 28, 2020
Messages
1,359
My favorite thing about the gun community. Everyone screams for innovation but when companies innovate the idea gets poo-poohed before it even hits the market.
I think the Poo-Poohing comes with the marketing and shilling of the product from “influencers” more than the innovation or product itself.
 
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