Terminator Tuner Testing on the CZ 457 - RimfireCentral.com Forums

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  #1  
Old 06-04-2020, 06:31 PM
ShawnCarlock

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Terminator Tuner Testing on the CZ 457



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05-25-20

Tuner testing today with the CZ 457

Model: Varmint
Serial # D187927
Barrel Length: 20.5
Barrel Twist: 1-16
Barrel Profile: .862 straight
Stock: factory pillar bedded
Trigger: factory, tuned to 8 oz.
Bedding: Epoxy recoil lug into stock
Base: DIP Inc. 20 moa 11mm adapter to Mil Spec rail
Rings: Warne VS rings 1
Scope: Weaver T36 36x
Tuner: DE Terminator Tuner

Testing flow chart:

Starting bottomed out, shoot 3 shot groups in 1 revolution increments
Find best group and shoot 3 shot groups starting at -1/2 revolution and ending at +1/2 revolution in .10 revolution increments.
Identify best group and shoot it again, also shoot +.10 and -.10 revolution again but all in 5 shot groups.
Write this setting down and log atmospheric conditions

Model: Varmint
Serial # D187927
Barrel Length: 20.5
Barrel Twist: 1-16
Barrel Profile: .862 straight
Stock: factory pillar bedded
Trigger: factory, light spring, adjusted 8 oz.
Bedding: Epoxy recoil lug into stock
Base: DIP Inc. 20 moa 11mm adapter to Mil Spec rail
Rings: Warne VS rings 1
Scope: Weaver T36 36x
Tuner: DE Terminator Tuner



All tuner testing conducted at 50 yards outdoors, benchrest, front mechanical rest and rear bag.

Baseline target with no tuner fired with Lapua Center X ammunition

DSCN3110.JPG

I fired targets at all tuner settings on the whole revolution. Clearly there were two nodes that appeared on at 2 turns out and another at 11 turns out. I decided to work the first node by itself. I shot from 0 revolutions to 3 revolutions with very similar results.

Tuner Test Target 02.jpg

Clearly 2 revolutions out was the best setting, cutting the baseline bottomed out setting down to a group 1/3 of the size. This was a significant reduction in group size. Now it is time to fine tune the setting. I shot groups at 1.75 revolutions, 2.0 revolutions and 2.25 revolutions. Each revolution moves the tuner approximately .010. The difference .010 makes is impressive and only goes to prove the sensitive nature of tuning .22 rimfire rifle.

Tuner Test Target 01.jpg

There is further testing to do as I can see that when we get out to 3 revolutions accuracy started to open up. There is the potential for slightly better accuracy between 2.00 and 2.75 revolutions. I will break the next groups down to 1/10 revolutions and shoot 10 shot groups conditions permitting to see if there is a slightly better setting to be found.
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  #2  
Old 06-05-2020, 06:26 AM
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Quote:
Originally Posted by ShawnCarlock View Post
05-25-20

Tuner testing today with the CZ 457

Tuner: DE Terminator Tuner
What does the tuner look like?
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  #3  
Old 06-05-2020, 07:25 AM
ShawnCarlock

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Here is the link to the original post with pics and here is another pic as well.

https://www.rimfirecentral.com/forum....php?t=1194043

22 tuner web.jpg

22 tuner web 2.jpg

22 tunwe web 3.jpg
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  #4  
Old 06-05-2020, 04:43 PM
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That's a good looking tuner.

I'm about to embark on figuring out how to tune a rifle with a Harrell tuner.

Was the baseline group size established as a result of a single five-shot-group? Were the groups shot at each respective tuner setting one group of three shots only?
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  #5  
Old 06-05-2020, 09:49 PM
ShawnCarlock

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The base line group was fired with 5 rounds single group, the tuner settings were all fired 3 shot groups a single in an effort to get into the "zone" quickly and then fine tune from there. I intend to shoot multiple 5 shot groups or 10 shot groups now that I have homed in pretty close the the best setting.

Glad you like the looks, my first priority was performance of course but I like nice, well executed, next level looking stuff.
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  #6  
Old 06-05-2020, 09:59 PM
Shamokinbob

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How much does it weigh
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  #7  
Old 06-06-2020, 07:40 AM
ShawnCarlock

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13.1 oz as you see it in the pic, that is at max weight.
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  #8  
Old 08-13-2020, 12:44 PM
FredJ_2008
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What is the length of the bare tuner and what are the sizes of any additional weights?
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  #9  
Old 08-14-2020, 07:52 AM
Hi-NV Shooter
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Quote:
Originally Posted by ShawnCarlock View Post
05-25-20

Tuner testing today with the CZ 457

Model: Varmint
Serial # D187927
Barrel Length: 20.5”
Barrel Twist: 1-16”
Barrel Profile: .862” straight
Stock: factory pillar bedded
Trigger: factory, tuned to 8 oz.
Bedding: Epoxy recoil lug into stock
Base: DIP Inc. 20 moa 11mm adapter to Mil Spec rail
Rings: Warne VS rings 1”
Scope: Weaver T36 – 36x
Tuner: DE Terminator Tuner

Testing flow chart:

• Starting bottomed out, shoot 3 shot groups in 1 revolution increments
• Find best group and shoot 3 shot groups starting at -1/2 revolution and ending at +1/2 revolution in .10 revolution increments.
• Identify best group and shoot it again, also shoot +.10 and -.10 revolution again but all in 5 shot groups.
• Write this setting down and log atmospheric conditions

Model: Varmint
Serial # D187927
Barrel Length: 20.5”
Barrel Twist: 1-16”
Barrel Profile: .862” straight
Stock: factory pillar bedded
Trigger: factory, light spring, adjusted 8 oz.
Bedding: Epoxy recoil lug into stock
Base: DIP Inc. 20 moa 11mm adapter to Mil Spec rail
Rings: Warne VS rings 1”
Scope: Weaver T36 – 36x
Tuner: DE Terminator Tuner



All tuner testing conducted at 50 yards outdoors, benchrest, front mechanical rest and rear bag.

Baseline target with no tuner fired with Lapua Center X ammunition

Attachment 218615

I fired targets at all tuner settings on the whole revolution. Clearly there were two nodes that appeared on at 2 turns out and another at 11 turns out. I decided to work the first node by itself. I shot from 0 revolutions to 3 revolutions with very similar results.

Attachment 218619

Clearly 2 revolutions out was the best setting, cutting the baseline bottomed out setting down to a group 1/3 of the size. This was a significant reduction in group size. Now it is time to fine tune the setting. I shot groups at 1.75 revolutions, 2.0 revolutions and 2.25 revolutions. Each revolution moves the tuner approximately .010”. The difference .010” makes is impressive and only goes to prove the sensitive nature of tuning .22 rimfire rifle.

Attachment 218617

There is further testing to do as I can see that when we get out to 3 revolutions accuracy started to open up. There is the potential for slightly better accuracy between 2.00 and 2.75 revolutions. I will break the next groups down to 1/10 revolutions and shoot 10 shot groups conditions permitting to see if there is a slightly better setting to be found.
Shawn, Question on the target and groups you got. was your POA center of the bull ? if this is correct your POA was center, where did your first and last shot land in correlation of POA

I am asking because the 1-Rev out group, if the first shot was the one at about 11-o'clock and the next two were centered. IMO the setting is below 2-rev out
probably between .75-1.50 out
one last thing you don't want shots to go left of POA at anytime when tuning.


Lee
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  #10  
Old 08-15-2020, 03:31 PM
Williwaw

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Quote:
Originally Posted by Hi-NV Shooter View Post
Shawn, Question on the target and groups you got. was your POA center of the bull ? if this is correct your POA was center, where did your first and last shot land in correlation of POA

I am asking because the 1-Rev out group, if the first shot was the one at about 11-o'clock and the next two were centered. IMO the setting is below 2-rev out
probably between .75-1.50 out
one last thing you don't want shots to go left of POA at anytime when tuning.


Lee
Boy Lee, those are gems. Any expansion would be much appreciated. Can you explain a bit further as to why/how you can interpret the order of the shots. And the second, can you provide any explanation as to why we should not be tempted to pursue tunes with a left POA. Any other gems like these you can think of along these lines would be great. As soon as I post this I'm going for the mail to check for my tuner. Thanks.
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  #11  
Old 11-19-2020, 12:32 PM
ShawnCarlock

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Lee,

Sorry this took so long, the first shot according to my testing log was the 3:00 shot then 11:00 then 7:00. POA was center of target, however I didn't have a super solid zero on the scope prior to installing the tuner, just close.
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  #12  
Old 11-19-2020, 12:38 PM
ShawnCarlock

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Here is the newest version of the Terminator Tuner, we have been doing a ton of testing on several rifle so that the production run is perfect when we make them.

DSCN3226.jpg
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  #13  
Old 11-19-2020, 08:12 PM
Hi-NV Shooter
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Originally Posted by ShawnCarlock View Post
Here is the newest version of the Terminator Tuner, we have been doing a ton of testing on several rifle so that the production run is perfect when we make them.

Attachment 235803
Very interesting, I am experimenting with weight collars that look very similar.
the weight is in the 14 gram or less not a lot of weight.

Lee
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