Tuna can

Johnny Boom said:
Here's a subsequent target with the SK RM without the tuner.

Circles are 1" in diameter, centres are 0.5". The extra shots at the bottom are courtesy of a fellow club member that needed to be reminded of target etiquette.

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you need 0.2 down

You're welcome
 
sab567 said:
you need 0.2 down

You're welcome
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You have a great sense of humour! Dont appologize for being able to speak in two languages. Your english is excellent and most can only speak one. Great videos and very informative. Thanks to both you and Johnny Boom for sharing this with all of us. Fascinating stuff and I hope ur happy cuz now Im gonna spend money and experiment more. I have an MTU 18" barrel and have done testing with my muzzle break,Insight Arms,and fount my particular rifle shoots all the ammo Ive tried better with it on than off. I started experimenting with how far in or out it was set and even that made small differences but so small that unless shot in exact same conditions it could be weather related. I dont know how much weight is required but it would be interesting to have different Tuna cans exactly the same but different weight and open up a whole new can of worms. Maybe the heavier would absorb more barrel vibration and flatten the wave making the high node and low node longer and flatter? Insight now makes their brake with indexed markings exactly for this reason. Anyway Im gettin long in the tooth. Thanks again Chris
 
Longstud said:
Thanks to both you and Johnny Boom for sharing this with all of us. Fascinating stuff...
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My pleasure, we all get a bit better when we share a little knowledge.

Funny you should mention brakes.

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ReddNobb Tuna Comps ready for testing!

We'll start a new thread on these soon.
 
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With regard to the data given above, for the Eley Match ammo, there are two sets of groups produced with the tuner, which Yanick says he selected for his competition ammo. (See posts 31-32.)

Each set of Eley Match results, one showing eight groups, the second showing ten. Each set has a wide range of results. The smallest in the first is .22" and the largest is .70". The largest group is over three times the size of the smallest. The second set varies from .23" to .65". Here the largest group is almost three times the smallest. There is a lot of group size variation over a relatively small number of groups.

If these are results produced with the tuner adjusted to produce the most favourable results, or at least a significant improvement, is it working as it should?
 
Tried out my Lilja barrel CZ 457 XRS with the Can and #5 produced the best group today. A bit windy but did my best waiting for a no wind moment.

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#0 - #9 is the setting on the tuner. Others may note it as 0.1 - 0.9.

One full turn is 0 - 9. Beginning a second full turn I will be documenting it as 10 - 19 and so on.

For now I'll be keeping it on #5. I'll be minimizing my testing as bulk CCI SV ammo from my LGS is non existent at the moment.
 
GimpyGolden said:
He stated #5 produced best today, so each was a different node setting.
Compare #5 to control w/o Tuna and there is significant improvement.
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Yes, indeed. The ROC did say target #5 was best, but I wasn't sure if the numbering on the target was for groups or a notation indicating tuner adjustment.

The ROC said:
#0 - #9 is the setting on the tuner. Others may note it as 0.1 - 0.9.

One full turn is 0 - 9. Beginning a second full turn I will be documenting it as 10 - 19 and so on.

For now I'll be keeping it on #5. I'll be minimizing my testing as bulk CCI SV ammo from my LGS is non existent at the moment.
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Thank you. This confirms what Gimpy knew and I didn't.

It will be interesting to see ten or more groups shot with the tuner set at #5 or 0.5 look like.

As a note of caution to readers in general, one group out of ten shouldn't be seen as conclusive or reliable evidence of how well this tuner works. Nor can a single "control group" without the tuner be a reliable baseline against which to compare the ten groups shot with the tuner.
 
I may have missed it, but how does the tuner attach? Is it a threaded attachment, and if so what is the thread size? Or does it clamp on with screws? Thanks.
 
Took advantage of a calm afternoon today to re-test the TC and confirmed setting #5 is good but also discovered #2 and #9 produced great results as well. Going to go with #2 now.

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Absolutely awesome shooting ROC. That’s super impressive with reasonably priced ammo. Good for you!!
 
On one target it's noted that the ammo used is CCI SV. Was it used for the other target as well? It should be noted that this ammo is often inconsistent, easily producing a variety of group sizes even with top quality barrels. In order to have confidence in testing results, better, more reliably consistent ammo may be needed.

Two targets are shown, with the one dated April 17/21, and also posted originally on that date. Then, as now, it was noted that tuner setting #5 produced the best results. The newer target, dated today, May 8, shows tuner settings #5 and #9 producing the best results. Nevertheless, on the older April 17 target, tuner setting #9 produced poor results. Is setting #9 partial to May but not April?

To help determine whether the tuner is doing something good, shoot ten five-shot groups without a tuner. Then shoot ten five-shot-groups at setting #2 and ten five-shot groups at setting #9 to see if the results are better than the tuner-less groups. That can help verify the results. Single groups aren't reliable, nor is ammo such as CCI SV.
 
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