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
Chatting and General Stuff
Polls
Which shooting chronograph do you use?
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="Shootin4fun" data-source="post: 853757" data-attributes="member: 28741"><p>Interesting....BnG. Wondering how the Chrony could be off 100fps on some rifles but not on others. </p><p></p><p>In the last few weeks I've noticed my velocities dropping aout 60 - 80fps on loads that were done at a different time from each other but a very consistent recipe . I thought maybe I need to totally decopper, but more copper in the barrel seems like should cause higher velocities due to pressure and speed, not less. Then I started wondering if there has been drift in my Chrony. But I found some older rounds and they reported within 20 fps of what I had recorded. </p><p></p><p>So I have a few questions, though maybe off the topic of chrono for a minute...</p><p></p><p>1) Does there come a point where copper fouling causes maybe more pressure but a drop in velocity due to added friction?</p><p></p><p>2) Has anyone seen velocity reports change like that with the use of a single chronograph over time? They are digital devices so seasonal temp changes shouldn't affect them. The clocking signal is typically generated by a quartz "chip" though and that could be responsible for a 2% change if they get really hot or cold. But temps here have not been extreme; between 70 & 85 degrees.</p><p></p><p>I HAVE noticed that the new Winch brass I bought seems to be a little "slower" than the Federal I've been using all along.</p><p></p><p>It almost seems like the little Varget that i have left has become "weaker". I have never experienced this before. </p><p></p><p>I cleaned the barrel but not totally decoppered, loaded a test set .5gr hotter and plan to go out in the next day or so to see what happens.</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 853757, member: 28741"] Interesting....BnG. Wondering how the Chrony could be off 100fps on some rifles but not on others. In the last few weeks I've noticed my velocities dropping aout 60 - 80fps on loads that were done at a different time from each other but a very consistent recipe . I thought maybe I need to totally decopper, but more copper in the barrel seems like should cause higher velocities due to pressure and speed, not less. Then I started wondering if there has been drift in my Chrony. But I found some older rounds and they reported within 20 fps of what I had recorded. So I have a few questions, though maybe off the topic of chrono for a minute... 1) Does there come a point where copper fouling causes maybe more pressure but a drop in velocity due to added friction? 2) Has anyone seen velocity reports change like that with the use of a single chronograph over time? They are digital devices so seasonal temp changes shouldn't affect them. The clocking signal is typically generated by a quartz "chip" though and that could be responsible for a 2% change if they get really hot or cold. But temps here have not been extreme; between 70 & 85 degrees. I HAVE noticed that the new Winch brass I bought seems to be a little "slower" than the Federal I've been using all along. It almost seems like the little Varget that i have left has become "weaker". I have never experienced this before. I cleaned the barrel but not totally decoppered, loaded a test set .5gr hotter and plan to go out in the next day or so to see what happens. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Chatting and General Stuff
Polls
Which shooting chronograph do you use?
Top