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
Rifles, Bullets, Barrels & Ballistics
Looking for a New Chronograph
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="bruce_ventura" data-source="post: 1022066" data-attributes="member: 34084"><p>To save time, I measure group size at the same time I'm measuring muzzle velocity. I fire five shots to get a group size. I usually get at least four good velocity measurements from an optical chrono in that group. </p><p></p><p>Having something attached to the muzzle can effect barrel vibration and thereby change point of impact and group size. I tried the magnetospeed once and it definitely shifted the point of impact on my rifle over 1" at 100 yds. For that reason alone I stuck with an optical chrono. They aren't perfect, but they give me the data I need. </p><p></p><p>High accuracy is not my primary goal. 99.5% accuracy is typical of optical chronos, which is sufficient to develop a load. I end up adjusting either velocity or BC later when I fit ballistics to actual bullet drops.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 1022066, member: 34084"] To save time, I measure group size at the same time I'm measuring muzzle velocity. I fire five shots to get a group size. I usually get at least four good velocity measurements from an optical chrono in that group. Having something attached to the muzzle can effect barrel vibration and thereby change point of impact and group size. I tried the magnetospeed once and it definitely shifted the point of impact on my rifle over 1" at 100 yds. For that reason alone I stuck with an optical chrono. They aren't perfect, but they give me the data I need. High accuracy is not my primary goal. 99.5% accuracy is typical of optical chronos, which is sufficient to develop a load. I end up adjusting either velocity or BC later when I fit ballistics to actual bullet drops. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Looking for a New Chronograph
Top