Chrony data on SA 7.62 Milsurp

Keebler750

Keebler750

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I was busy fiddling around at the range the other day and tested that South African Milsurp stuff. I was wondering what these numbers are like, as I am just starting to use a chrony and I don't know good from bad......I knew YOU GUYS would, though........

Ten shots in the string, from a Norc M14...
Low - 2685
High- 2743
Avg.- 2705
Extreme Spread - 57.83
Standard Dev. - 20.49

Air and Ammo Temp - 39 F

What can you tell me about the accuracy or consistency of this ammo from the data? I'd be interested to hear from your experience. (I do know what the stat terms mean.)

How good is this ammo? If I don't chamber a new round to heat it up, will that show up in the data? Etc, etc...
 
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Well.... The low is the slowest speed recorded and the high is the fastest. (obviously) As for the average (speaks for itself), Extreme spread is the difference between fastest and slowest. Generally you want this to be as small a number as possible. 57fps between fastest and slowest is not bad for milsurp ammo. The smaller the gap, generally the better and more consistent the groups should be.
Standard deviation is the difference from the average speed. Again it should be as small a number as possible for consistency and accuracy.
Looks like the SA 7.62 is not bad according to your figures and is running on the warmer side (2700fps is not bad for 7.62). :D

just my 2 cents....
 
I'm actually worried this is better data than my 270WSM reloads. Ugh! Unfortunately, I forgot to SAVE that string!!!

50fps is good for deviation of 1MOA in the group isn't it?
 
It's a bit slow for a NATO round.
Nato spec is 2750 fps at 78 feet from the muzzle.
Could be the chrony or the lighting that day. Were you using the sky screens?
I cronyed an Indian NATO round and got 2821 about 10 ft from the muzzle.

I've chronyed factory whitebox Winchester FMJ .308 and got2713,2751,2745,2738,2757,2775,2758,2755,2734,27 70.
The yellow box Remington UMC 150 FMJ .308 was 2844,2780,2776,2856,2740.
 
Well, it was less than 40 F out, so that would account for some of the velocity issues, wouldn't it? And this is 147gr match bullets. Is that the same NATO spec? Also, what rifle were you chrony'ing with? Mine was the Norc M14. I'm thinking barrel length.

Not arguing, per se, just trying to understand the variables abit from other perspectives. :)
 
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