Range Report 3 fps deviation out of 6.5x47

Prebanpaul

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Today while at the range, I chronoed a fellow shooters rounds. I was highly impressed by his deviation in FPS. 5 rounds chrono on my magneto speed and he had a 3 fps deviation in between his five rounds. He was shooting a 6.5x47. He was 2947-2950. I am around a 20 fps deviation. What are your usual deviations.
 

Dogtown

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I don't know if I'm suddenly getting better at making precision ammo (not likely) or 6.5x47L is a very forgiving cartridge - I'm getting single digit SD more frequently than I ever did with .308WIN.
 

former naval person

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I'd prefer to think that it was a fluke...that is .1%...I'd bet that even the Magnetospeed isn't that accurate. Bell shaped curves being what they are, you hit the small end. JMHO
 

6.5x47

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My current load of 40.8 gr H4350, CCI 450 and 140 Hybrid is typically giving me 14 ES and 4 SD's. Typical sub 1/2 moa 5-shot groups @ 950 yds. Now if I could just get the dang thing sighted in properly to hit the center of the target instead of low right.

Alan
 

Dogtown

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I should point out that switching from GM205M to CCI 450 make my groups collapse onto each other and my SD drop to single digits.
 

BGE541

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  • Sep 6, 2011
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    I should point out that switching from GM205M to CCI 450 make my groups collapse onto each other and my SD drop to single digits.

    I am not much of a group shooter but I starded using the CCI 450 and the consistancy at range has been stunning.
     

    Dogtown

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    It was an almost religious experience for me having tuned a load using N550 to the point where it was shooting better than any of my other combos, yet I had a feeling my rifle could do much better than 1MOA. On a whim I switched to the CCI 450s and ran the same load and couldn't believe my eyes as not only was every hole touching, they were well overlapping.
     

    excaliber

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    Just remember that just because your ES & SD is great doesn`t mean accuracy will be. Tried AR Comp in 308, Lapua brass, 175gr Berger, Pacnor barrel, Mcmillan stock, Jewell trigger, ES & SD were single digit but accuracy was terrible, 1 moa @ 300yds. Getting ready to try some H-4895 & Varget instead. I want my rifles shooting at least 3/4" at that 300yds or back to drawing board.
     

    Dogtown

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    True, but SD & ES seem to be a good way to gage how uniform your loads are, both in component combination and handloading technique. But as you say, those parameters do not determine load accuracy.
     

    McCrazy

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    Just remember that just because your ES & SD is great doesn`t mean accuracy will be. Tried AR Comp in 308, Lapua brass, 175gr Berger, Pacnor barrel, Mcmillan stock, Jewell trigger, ES & SD were single digit but accuracy was terrible, 1 moa @ 300yds. Getting ready to try some H-4895 & Varget instead. I want my rifles shooting at least 3/4" at that 300yds or back to drawing board.

    Do you mean 3/4 moa at 300 yards? Not saying it is impossible but trying to get 3/4" consistently at 300 yards sounds like the path towards insanity.