Vudoo 22S, Harell Tuner Hopewell Method UPDATE 3/18

[garandman]

So I got my Harrell tuner installed on my Vudoo 22 S ( shown w/o tuner, but it looks the same as every other one) Trigger Tech trigger set at 4 oz. Love it. (Hated the Jewell, at 1.5 oz)



Here's the Hopewell Method, described:


Preliminary Tuning:
Don't worry about cross wind effects at this point as you are trying to tune the rifle to shoot with the least vertical stringing. It is best to do the testing in calm wind and definitely not in a head or tail wind.
Use the ammunition you plan on using in a match (measured and sorted). You cannot tune the rifle with one type of ammo (hi-velocity hunting) and expect good performance with another type (match grade target).
1. Set your tuner to "0" and fire two shots.
Turn tuner one complete revolution (25 clicks) and fire two shots at the same Point of Aim. Continue this until you reach "100". You now have a 10 shot group, all shot at the same POA.
2. Repeat step one from "100" to "200"
3. Repeat Step one from "200" to "300".
4. Repeat Step one from "300" to "400"
5. Repeat Step one from "400" to "500".
You now have five 10-shot groups.
If you notice the groups opening up vertically, finish the step you're on and move on to Intermediate Tuning.
One of the 10-shot groups will show the smallest vertical stringing.
You should have used only 50 rounds so far (or less).

Full link: http://newbrunswick-benchrest.blogspot.com/2016/01/the-hopewell-method-of-barrel-tuning.html

Here's the initial tuning:



Observations:

1. The first 6 shots, adjuating from "zero" to 25 to 50 formed a nice tight group, then opened up as I adjusted from 50 to 75 to 100.

2. The 100 to 200 group was all over the place (focusing primarily on the vertical stringing, not the windage)

3. The first 6 shots in the 200 - 300 group all grouped nicely . (at 200, 225 , and 250)

4. I then first 5 shots groups at 0, 25, 50, and then against at ). Mixed results (pictured above, second target line)

So I fired 5 shot groups at 0, 50, 200 and 225.




Right now, I'd say my sweet spot is 200 , but I need to re-test / repeat / falsify that setting.

Interestingly, John Langley (on another build) said to start at 150 and work up. Seems about right.

 

[1Merlin]

Not surprised that the sweet spot ends up at approximately the center of the adjustment range. I just did a 5413 BR and the sweet spot was very apparent at the 200-300 node with ~1 revolution before 300 being the best. I might end up buying a Vudoo just to see if a little bug-hole with the 2013 can be an even smaller bug-hole with a Vudoo.

 

[garandman]

1merlin -

I got both the repeater and single shot Vudoo and I could not in any way be more pleased.

 

[gkgeiger]

When I bought my 2500XS Jerry told me to start at 200 and adjust in and out from there. I ended up around 220 I think.

 

[grauhanen]

How long is the barrel on your Vudoo?

Right now, I'd say my sweet spot is 200 , but I need to re-test / repeat / falsify that setting.

Retesting is a must (but it shouldn't be necessary to fake anything).

 

[garandman]

How long is the barrel on your Vudoo?

Retesting is a must (but it shouldn't be necessary to fake anything).

20" bbl

Do you know what falsify means? It doesn't mean "faking." It means to give your working theory the opportunity to fail.

 

[garandman]

When I bought my 2500XS Jerry told me to start at 200 and adjust in and out from there. I ended up around 220 I think.

I had trouble finding any definitive testing / literature on how to set the tuner, so I decided to start from scratch. My dumb luck, I'd start at 200 and work to 400, and the sweet spot would be 190.

 

[1911nut]

I had trouble finding any definitive testing / literature on how to set the tuner, so I decided to start from scratch. My dumb luck, I'd start at 200 and work to 400, and the sweet spot would be 190.

You sure there isn’t a better setting? There’s like what 500 clicks .
or was it really that easy .

 

[Tim Slater]

Do you know what falsify means? It doesn't mean "faking." It means to give your working theory the opportunity to fail.

Out of interest, is that a US definition, perhaps recent academic jargon? Neither my Collins nor my Oxford dictionaries list any definition of, or like, testing a hypothesis, just variations on the original Latin to make false. Language does change in teresting ways though.

 

[garandman]

You sure there isn’t a better setting? There’s like what 500 clicks .
or was it really that easy .

Better than the one hole at 200 ? In a swirling wind? At that size grp, the problem will be the shooter, not the gun, ammo or tuner.

If 200 can consistently produce that 5 shot grp, Im happy

 

[garandman]

Out of interest, is that a US definition, perhaps recent academic jargon? Neither my Collins nor my Oxford dictionaries list any definition of, or like, testing a hypothesis, just variations on the original Latin to make false. Language does change in teresting ways though.

Yes. My goal in "falsifying" Would be to see if I can make it false. To see if this setting will open up my groups at all. To see if it is false that 200 is the best setting.

 

[Hi-NV Shooter]

Yes. My goal in "falsifying" Would be to see if I can make it false. To see if this setting will open up my groups at all. To see if it is false that 200 is the best setting.

Hi garandman, Good to see you posting again. on the tuner setting and the results, would this be for a single lot # ? if you have different lot # try and see if that setting will shoot say if you have 3 different lots 2-shots each into the same group

Lee

 

[Tim Slater]

Yes. My goal in "falsifying" Would be to see if I can make it false. To see if this setting will open up my groups at all. To see if it is false that 200 is the best setting.

Thank you. So it's useful as a synonym for disprove. That might take a few years to cross the pond. It seems odd that anyone would have ignored the normal pejorative tone. Still odder things happen.

 

[garandman]

Hi garandman, Good to see you posting again. on the tuner setting and the results, would this be for a single lot # ? if you have different lot # try and see if that setting will shoot say if you have 3 different lots 2-shots each into the same group

Lee

I am assuming the different lot numbers you are recommending to test would all have the same speed?

 

[garandman]

Thank you. So it's useful as a synonym for disprove. That might take a few years to cross the pond. It seems odd that anyone would have ignored the normal pejorative tone. Still odder things happen.

I guess I did mean it in the pejorative sense of trying to make sure I do not have a false positive.... Making sure this setting works all the time every time.

I've had enough hand loads and enough rim fire experience to know that it's easy to get false positives... That a certain level of skepticism is necessary when you find a load that works once or twice. It either works every single time or it really doesn't work at all.

 

[Hi-NV Shooter]

I am assuming the different lot numbers you are recommending to test would all have the same speed?

Ideally if they are different speeds, and what I mean by into the same group is not necessarily one hole but all shots touch and form the smallest group possible. if POI changes where shots are outside of the group then some further adjustment would probably be needed.

Lee

 

[garandman]

Vegas -

I've got over 3000 rounds of this 326 m /sec Midas + which should last me a while. Ironically it shoots very well in both my Vudoo 22R and this Vudoo 22S.

I got some 327 M/S Center X that I i could test. Or are you thinking it should be a diff lot of the Midas ?

 

[Hi-NV Shooter]

Vegas -

I've got over 3000 rounds of this 326 m /sec Midas + which should last me a while. Ironically it shoots very well in both my Vudoo 22R and this Vudoo 22S.

I got some 327 M/S Center X that I i could test. Or are you thinking it should be a diff lot of the Midas ?

You can use Center X ,best way to check the settings is to use the best shooting lots. at the best tuner setting you can pretty much shoot any lot and it will still shoot the same or nearly the same. and only the quality of the lot will show any difference.
meaning if it drills with say Midas+ and CX and then you shoot say a random lot of SK you will get some similar groups, but the ammo itself will quickly show why it is graded SK
hope this makes sense
well off to work

Lee

 

[grauhanen]

Do you know what falsify means? It doesn't mean "faking." It means to give your working theory the opportunity to fail.

My goal in "falsifying" Would be to see if I can make it false. To see if this setting will open up my groups at all. To see if it is false that 200 is the best setting.

I know what the word "falsify" means. Your definition is one that's not in current use.

What you're looking to do is verify -- to establish the truthfulness or accuracy -- of your tuner setting. If it fails your verification process, it can't be accurate or correct.

 

[garandman]

I know what the word "falsify" means. Your definition is one that's not in current use.

What you're looking to do is verify -- to establish the truthfulness or accuracy -- of your tuner setting. If it fails your verification process, it can't be accurate or correct.

Whatever. Im not here to debate the dictionary. If you have something about tuners... otherwise, Have a great day.