ES question

[fr3db3ar]

Yes, it was a small sample, 5 for the 223 and 6 for the 308. Good info to know on Gunny.

Now I need to find some space to stretch these puppies out a little.

 

[jcampbellsmith]

Ok, I ran the numbers for the SD

223 = 22.7
308 = 13.4

Good ? Bad ?

Not bad at all, I was told a SD of <10 was very good. Regards JCS

 

[jhelmuth]

ES only tells you the difference in velocity between your fastest and slowest shots, nothing else. No amount of hocus pocus can get ES to tell you anything more.

http://riflemansjournal.blogspot.co.uk/2010/07/statistics-for-rifle-shooters.html

Regards JCS

You are correct regarding load development. However, ES will give you a good measurement of your load consistency (IE - skills). ES will go down as the consistency of the cartridge load gets better.

I use ES to tell me how I'm doing with my loading techniques. Obviously your SD will also be impacted in a positive way with lower ES as well.

 

[jhelmuth]

Ok, I ran the numbers for the SD

223 = 22.7
308 = 13.4

Good ? Bad ?

Not bad at all, I was told a SD of <10 was very good. Regards JCS

One way to reduce your SD is to have a lower ES. Now over a larger sample, you SHOULD lower your SD as well (assuming you have any skill at all with respect to loading) - so there is another factor to lower SD. Taken together, ES and SD should give you a good sense about how consistent your loading techniques are as well as the proability that those rounds can produce smaller groupings.