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  #16  
Old 07-24-2019, 02:02 PM
jaia
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Raining here and I'm bored....so, question time.

Why is Standard Deviation of importance when Extreme Spread loses competitions?

The SD is a calculation of where the majority of mv's fall, about 2 out of 3 shots,
but that means about 1 of 3 is outside the SD and results in major strays.
And SD has to be doubled to understand why the average group size measures what it does.
SD of 14 means 14 fps above and below the average, 28 fps average spread.

Like I said, raining...bored...thinking about the numbers.
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  #17  
Old 07-24-2019, 02:50 PM
zukiphile
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Originally Posted by jaia View Post
Raining here and I'm bored....so, question time.

Why is Standard Deviation of importance when Extreme Spread loses competitions?
...
Like I said, raining...bored...thinking about the numbers.
It doesn't need to be raining for me to be bored.

I believe many of us shoot recreationally, but not competitively.

When I look at the results in your 200 yard testing, I see two different kinds of eight or ten inch groups. One kind is a sort of evenly distributed pattern. Another is a really respectable group with just a few outliers. If you are just shooting non-competitively, those outliers aren't a big deal. If you miss, you shoot at the rock, can, paper, etc. again.

The first kind of pattern, the evenly distributed one, may mean that even the follow up shots will miss too.
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  #18  
Old 07-24-2019, 04:53 PM
abeltbuckle
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Quote:
Originally Posted by jaia View Post
Raining here and I'm bored....so, question time.

Why is Standard Deviation of importance when Extreme Spread loses competitions?

The SD is a calculation of where the majority of mv's fall, about 2 out of 3 shots,
but that means about 1 of 3 is outside the SD and results in major strays.
And SD has to be doubled to understand why the average group size measures what it does.
SD of 14 means 14 fps above and below the average, 28 fps average spread.

Like I said, raining...bored...thinking about the numbers.
I want to focus on SD and other averages for practice purposes. More of a mindset to pull data(and have feedback) from everyshot rather than just the outliers. Regardless, I hope to keep all that data intact to view under any perspective.

Last edited by abeltbuckle; 07-24-2019 at 04:56 PM.
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  #19  
Old 07-24-2019, 07:23 PM
Hi-NV Shooter
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Originally Posted by abeltbuckle View Post
I do hope to trial different recoil springs during my tests.

I wish I had slow mo footage of a 10/22 shooting because there should be two schools of thought about which recoil springs might improve accuracy the most.
You'd either be looking for the lightest recoil spring which would keep the bolt from striking the buffer during operation(and still cycle the gun), assuming the buffer is struck before the bullet exits the barrel(and this would be the largest vibration).
Likewise, you could look for the lightest recoil spring which would still keep the bolt from striking the buffer before the bullet exits the barrel(and still cycle the gun).
I shoot with someone who has a lot of experience fooling with 10/22 he uses grease I believe as a lube for the bolt and says from his experience testing it makes a difference. along with recoil spring rates.

Lee
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  #20  
Old 07-24-2019, 08:06 PM
David Valdina
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My answer to your question, yes it's worth it.

I have a Harrell Tuner on a Remington 513T, not exactly a match grade rifle. The barrel was cut back just aft of the front sight. I forget the barrel diameter. I tend to shoot middle of the road ammo, Wolf Match Extra, SK Rifle Match, CMP's Eley bulk. The tuner does make the rifle shoot better. To me, it was worth doing.
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