Tndeer Logo

Page 1 of 1 1
Topic Options
#3268459 - 06/15/13 06:57 AM Help explaining numbers
Jcalder
8 Point


Registered: 09/18/12
Posts: 1102
Loc: Tennesse

content Online
I just got a chronograph. Took it out and shot several rounds. I understand what the mean is. I understand extreme spread. I'm vague on standard deviation tho. And what do my numbers really tell me. What is an acceptable extreme spread and what is an acceptable SD
Top
#3268479 - 06/15/13 08:37 AM Re: Help explaining numbers [Re: Jcalder]
BigD_625
10 Point


Registered: 09/30/09
Posts: 3371
Loc: Maury County, TN

Offline
Standard deviation is how much it differs from the mean. If you drew dots for the speeds the bullets went, then drew a curve to connect the dots, the SD would be the distance left or right from the middle of the curve. This represents how much slower or faster than the mean (average speed).
_________________________
-----------
It's better to be smarter than you look...than to look smarter than you are.

Top
#3268533 - 06/15/13 12:09 PM Re: Help explaining numbers [Re: BigD_625]
Deer Assassin
Non-Typical


Registered: 08/01/03
Posts: 87000
Loc: Kingston Springs

Offline
lower the numbers the better
_________________________
Drag Racing

Spending money I dont have

on things I dont need

to impress people I dont know

Top
#3268539 - 06/15/13 12:43 PM Re: Help explaining numbers [Re: Deer Assassin]
Jcalder
8 Point


Registered: 09/18/12
Posts: 1102
Loc: Tennesse

content Online
Here are the numbers I have. I'm shooting a 308, 165 sgk over 44.6 varget. Cci primers. Win brass

Extreme spread was 156
High was 2841. Low was 2685

Mean was 2770

I punched in my velocities that I recorded into an online calculator. Standard deviation was 53.627

My extreme spread seems awful big. SD seems high but these numbers are new to me and I don't know how to verify the online calculator. I found it odd that the first 7 rounds were between 2685-2777. Last 4 were 2815-2841.

Top
#3268541 - 06/15/13 12:54 PM Re: Help explaining numbers [Re: Jcalder]
EastTNHunter
10 Point


Registered: 03/08/10
Posts: 2895
Loc: Rhea Co., TN

Offline
How were your groups? That is the main thing...
Top
#3268543 - 06/15/13 12:58 PM Re: Help explaining numbers [Re: EastTNHunter]
Jcalder
8 Point


Registered: 09/18/12
Posts: 1102
Loc: Tennesse

content Online
They are under an inch 90% of time. With this particular bullet my best is .70"
Top
Page 1 of 1 1


Moderator:  RUGER, gtk, Bobby G, Unicam, CBU93, stretch, TurkeyBurd, Kimber45, Mrs.Unicam, Crappie Luck 
Hop to:
Top Posters
4105517
RUGER
87000
Deer Assassin
65406
BSK
61010
Crappie Luck
51376
spitndrum
Newest Members
Mik475, AaronB, Bad Wolf, jw3783, Jesse91
13279 Registered Users
Who's Online
111 registered (deadhead870, lungpuncher1, TAFKAP, catman529, danny1975, East TN Hunter, 14 invisible) and 115 anonymous users online.
Forum Stats
13279 Members
42 Forums
93159 Topics
1088950 Posts

Max Online: 788 @ 11/11/13 08:06 PM
Moon Phase
CURRENT MOON
September
Su M Tu W Th F Sa
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30
Forum Donations
The TnDeer.Com Deer Talk Forum is for Tennessee Deer Hunters by Tennessee Deer Hunters. If you enjoy using our Talk Forum and would like to contribute to help in it's up-keep. Just submit your contribution by clicking on the DONATE button below and paying with PayPal or a major credit card. Any amount is much appreciated. Thanks for your support!

TN Burn Safe

Generated in 0.097 seconds in which 0.001 seconds were spent on a total of 14 queries. Zlib compression enabled.