Thoughts on Extreme Spread + Standard Deviation with different calibers?

)Stephan

)Stephan

Member
Dear all,

I was testing some 6PPC cartridges for the nationals (germany / 30 shots score / preloaded) today with SMK 70grs Bullets.

Extreme spread over 45 shots was roughly 25fps and standard deviation was <6fps. Not too bad I guess..

I noticed that over time there was a more or less linear decrease in velocity (last shots were slower than first shots).

Should it be possible to achieve similar consistency for other calibers (e.g. .308Win) with the same reloading procedure?
I am wondering why the .308Win produces fairly higher results for me even though the procedure is (overall) the same.

P.S. Pics attached :) (Please ignore Power Factor)

Brgds.
Stephan
 

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If you are shooting short range it doesn't really matter. 100-300 for sure. 600,maybe,1000 yes. The 600 and 1000 stuff is what others that shoot those distances have told me. I do not shoot them myself
 
es and sd are data based info . but the info to be valid is from a large sample size..as in 1000 or 10000...not 5 nor 10 nor 20.
they are nice when the target is good, but the numbers will never make a good target
 
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