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Chronographing brass

 
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  #8  
Old 06-24-2010, 07:56 PM
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Join Date: Jan 2009
Location: NW OHIO
Posts: 286
Re: Chronographing brass

I have several of my favorite loads that have more than 27fps spread. No worries there
How many loads were checked? High quality chronograph?
Were all of the Rem cases from the same lot?
Were all of the bullets weighed and the same weight exactly?
was a fouling shot fired from a clean barrel?

I am not trying to be an ass but there are many more variables also
again 27 fps spread is not what I would worry about if the load groups well on paper
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  #9  
Old 06-24-2010, 11:04 PM
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Join Date: Jul 2004
Location: Texas
Posts: 5,380
Re: Chronographing brass

Quote:
Originally Posted by ReDnEcKBoHuNtEr View Post
I bought a chrono the other day and loaded up my 35 gr VARGET with a 55 grain bullet and cci primers(for my 22-250). i trickled the powder and the biggest difference was .1 (35 gr compared to 35.1)...i used all the same REMINGTON casings

when i shot it through the chrono i was getting different readings... i shot 5 shots and they went from 3599-3626....is that going to be a problem. i really only want to have an accurate drop chart out to 500 yards as i am also working on a 7mm-08 project. Is there something i did wrong to get different readings or is that 27 fps difference not going to be a problem when shooting at 500 yards
27 ft/sec is not bad for light 22 cal bullets but you will want to get in the 10 to 15 area to
shoot 500+yards.

Standard deviations are a indication of load quality. (The lower the SDs The better the load).

If you can get in the single digit SDs (.09 - )you are home.

The larger/heaver bullets of the 7/08 should be easier to get lower numbers.

Always use 5 or more shots to calculate SDs and ESs.

J E CUSTOM
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  #10  
Old 06-25-2010, 06:04 AM
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Join Date: Jun 2010
Posts: 6
Re: Chronographing brass

ok thanks johhny, thats a good idea...kinda common sense if i would a thought about it a little
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