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 Extreme Long Range Hunting & Shooting (ELR) Over 1,000 Yds.

# 1000 yard problems.

#22
05-28-2012, 02:30 PM
 Gold Member Join Date: Sep 2008 Location: Republic of NJ Posts: 906
Re: 1000 yard problems.

Quote:
 Originally Posted by Lancet What does ES and SD stand for? That's where you lose me.
ES = extreme spread between velocities, and SD = the standard deviation of said velocity.
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#23
05-28-2012, 02:53 PM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,767
Re: 1000 yard problems.

Quote:
 Originally Posted by Lancet What does ES and SD stand for? That's where you lose me.
Lancet,

ES stands for Extreme Spread (speaking of the velocities)

Example:

2995 fps
3005 fps
2994 fps
3002 fps
3003 fps

The difference between the highest number and the lowest number is 9 fps
so your ES = 9 fps

The SD is a bit more complicated but it stands for "Standard Deviation".

In statistics and probability theory, standard deviation shows how much variation or "dispersion" exists from the average.

So in our example above, the average is 3000 fps, (The sum of all five values divided by 5)

Average = 3000 fps
ES = 9 fps
SD = 5 fps

I hope that helps.
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