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
Rifles, Reloading, Optics, Equipment
Reloading
Load Development... Ladder Day Revelations???
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="AJ Peacock" data-source="post: 144415" data-attributes="member: 4885"><p>[ QUOTE ]</p><p>RE: chrono assessment of velocity spread.</p><p></p><p>most chronograph setups out there are not accurate enough to give you a statistically signifigant number.</p><p></p><p>i.e.: Chrony chronographs will err +-15fps on a 3000fps load with 1-foot spacing.</p><p></p><p>Oehler 35's on a 2,4,8 ft rail are better but to get REAL numbers accuracy needs to be +- a couple fps...</p><p></p><p>YMMV,</p><p>JB </p><p></p><p>[/ QUOTE ]</p><p></p><p>Obviously if the chronographs where perfect, that would be better, but they aren't. In my opinion though, measuring velocities (even with a +-15fps error) and using that WITH target information is better than using target information only. A 15fps velocity difference is going to show up as only 1/10 MOA on target. </p><p></p><p>Given a large enough sample size with a known 15fps error, you can still come to conclusions on actual statistically relevant spreads. I'm not good enough to read anything at the 1/10 MOA level from a target though.</p><p></p><p>Where did you get the 15fps spread info? A good way to test it would be to shoot through 2 chronos at once. Then compute the average deviation of their differences. If someone has done this, point me at the information. It might be a nice experiment to try this summer.</p><p></p><p>Don</p></blockquote><p></p>
[QUOTE="AJ Peacock, post: 144415, member: 4885"] [ QUOTE ] RE: chrono assessment of velocity spread. most chronograph setups out there are not accurate enough to give you a statistically signifigant number. i.e.: Chrony chronographs will err +-15fps on a 3000fps load with 1-foot spacing. Oehler 35's on a 2,4,8 ft rail are better but to get REAL numbers accuracy needs to be +- a couple fps... YMMV, JB [/ QUOTE ] Obviously if the chronographs where perfect, that would be better, but they aren't. In my opinion though, measuring velocities (even with a +-15fps error) and using that WITH target information is better than using target information only. A 15fps velocity difference is going to show up as only 1/10 MOA on target. Given a large enough sample size with a known 15fps error, you can still come to conclusions on actual statistically relevant spreads. I'm not good enough to read anything at the 1/10 MOA level from a target though. Where did you get the 15fps spread info? A good way to test it would be to shoot through 2 chronos at once. Then compute the average deviation of their differences. If someone has done this, point me at the information. It might be a nice experiment to try this summer. Don [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Load Development... Ladder Day Revelations???
Top