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Node...please explain

 
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  #1  
Old 04-04-2011, 10:35 PM
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Node...please explain

Hey guys and gals just wondering if someone can help me make some sense of a couple of terms I see being used a lot on here.

Node, as in finding the node?

SD, I've seen used with along with ES (extreme spread I get)?

Killing critters at 1300+ yards??? Please help me with this one especially!!!

I love this site and spend way to much time on here but can't get enough. I'm thirsty for knowlege and you guys are great teachers!
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  #2  
Old 04-07-2011, 03:56 PM
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Re: Node...please explain

accuracy node typically means a point were the barrel whip is at top dead center (still point) AND harmonics from case expansion is at the rear of the action. if the bullet leaves the barrel when this vibration is at the front the vibration will be transfered to the bullet and it will fly horrible.
sd is sectional density or how much a bullet wieghs per calibler
es is extreme spread the difference from shot to shot
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Old 04-07-2011, 04:13 PM
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Re: Node...please explain

When used with a crongraph SD stands for Standard Deviation, a statistical term.
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Old 04-07-2011, 08:05 PM
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Re: Node...please explain

Quote:
Originally Posted by Russ Hatch View Post
When used with a crongraph SD stands for Standard Deviation, a statistical term.
This is the SD I was referring to. Could someone elaborate???
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Old 04-07-2011, 08:12 PM
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Re: Node...please explain

Quote:
Originally Posted by load View Post
accuracy node typically means a point were the barrel whip is at top dead center (still point) AND harmonics from case expansion is at the rear of the action. if the bullet leaves the barrel when this vibration is at the front the vibration will be transfered to the bullet and it will fly horrible.
sd is sectional density or how much a bullet wieghs per calibler
es is extreme spread the difference from shot to shot
Thanks for the reply, I knew it was something to do with barrel harmonics but that's all I knew. The SD I was referring to was Standard Deviation. Still trying to figure out what excactly that means???

Thanks for helping out a rookie guys I sure appreciate it!!!

One more question. How do you control the timing to find your node, adjust the charge?
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  #6  
Old 04-07-2011, 08:23 PM
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Re: Node...please explain

ES is a statistical term and is the difference in velocity between your fastest shot and slowest shot. The lower the ES the more consistent your velocities get.

Standard Deviation is used in much the same manner but it shows how far away from your average velocities you can expect most of your shots to be. Just like ES a low SD usually produces the best accuracy. It's kind of hard to explain without using formulas and graphs but here's a link that I used to understand the terms myself when I was taking a statistics class a few semesters back.

Standard deviation - Wikipedia, the free encyclopedia
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  #7  
Old 04-07-2011, 08:49 PM
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Re: Node...please explain

Thanks that helps. Is it possible to have a low ES but high SD?
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