Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
1000 yard problems.
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="270winshort" data-source="post: 652791" data-attributes="member: 6471"><p>S.D. stands for Standard Deviation, which is the average difference between muzzle velocity from shot to shot Example; 5 shot group shot 1 3125 fps</p><p> shot 2 3250 fps</p><p> shot 3 3200 fps</p><p> shot 4 3175 fps</p><p> shot 5 3165 fps </p><p> This would be an example of a load that has a large extreme spread 125 fps the s. d. on this load would be somewhere around 25 to 28 fps.</p><p></p><p>An example of good S.D. would be shot 1 3200 fps</p><p> shot 2 3220 fps</p><p> shot 3 3210 fps</p><p> shot 4 3218 fps</p><p> shot 5 3207 fps</p><p>In this example the extreme spread is only 20 fps which would give you a S.D. (or avaerage) of around 5 fps.</p><p></p><p>What this means is your load is tuned and it is going to be much more consistent, I always try to find a load that has an S.D. in the single digits(9 or less)</p><p></p><p>When shooting out past 500 yards this will make a differnce, your groups will be better, I would take a load with a low S.D. that shot a 5/8" group at a 100 yards over a load that shot a 1/4" group at a 100 yards with a high S.D.</p><p></p><p>Hopes this helps I am not good at putting Sh-- on paper there are others on here that could explain it better if you would like more info you can pm me and I can give you my phone #</p></blockquote><p></p>
[QUOTE="270winshort, post: 652791, member: 6471"] S.D. stands for Standard Deviation, which is the average difference between muzzle velocity from shot to shot Example; 5 shot group shot 1 3125 fps shot 2 3250 fps shot 3 3200 fps shot 4 3175 fps shot 5 3165 fps This would be an example of a load that has a large extreme spread 125 fps the s. d. on this load would be somewhere around 25 to 28 fps. An example of good S.D. would be shot 1 3200 fps shot 2 3220 fps shot 3 3210 fps shot 4 3218 fps shot 5 3207 fps In this example the extreme spread is only 20 fps which would give you a S.D. (or avaerage) of around 5 fps. What this means is your load is tuned and it is going to be much more consistent, I always try to find a load that has an S.D. in the single digits(9 or less) When shooting out past 500 yards this will make a differnce, your groups will be better, I would take a load with a low S.D. that shot a 5/8" group at a 100 yards over a load that shot a 1/4" group at a 100 yards with a high S.D. Hopes this helps I am not good at putting Sh-- on paper there are others on here that could explain it better if you would like more info you can pm me and I can give you my phone # [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
1000 yard problems.
Top