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
General Discussion
Do Bullets Go To Sleep?
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="Michael Courtney" data-source="post: 835205" data-attributes="member: 28191"><p>You have a nice experimental design. We've often considered shooting through multiple targets to assess dispersion at different ranges, but never tried it. Too much concern for human error (our part) and wind drift. Thought we might have to do it at night to have sufficiently still conditions, but then many ranges do not allow shooting at night. We have figured out that very thin transparencies are probably the best intermediate targets. It is easier to line up transparencies than paper targets, especially if a laser is available.</p><p></p><p>We chose the 40 grain bullet for several reasons. 1) We needed a bullet we could slow down to Mach 1.2 and still be stable in the 1 in 12" test rifle. 2) We wanted a bullet with good accuracy in the test rifle across a range of muzzle velocities. Prior work with this bullet demonstrated this. 3) We wanted a bullet that had excellent shot to shot consistency with drag/BC determinations. A lot of other bullets have significantly larger shot to shot variations in drag/BC than this one. The differences in drag we observed were not too much smaller than the uncertainties in drag. A bullet with larger shot to shot variations in drag would mask the effect we were hoping to observe.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 835205, member: 28191"] You have a nice experimental design. We've often considered shooting through multiple targets to assess dispersion at different ranges, but never tried it. Too much concern for human error (our part) and wind drift. Thought we might have to do it at night to have sufficiently still conditions, but then many ranges do not allow shooting at night. We have figured out that very thin transparencies are probably the best intermediate targets. It is easier to line up transparencies than paper targets, especially if a laser is available. We chose the 40 grain bullet for several reasons. 1) We needed a bullet we could slow down to Mach 1.2 and still be stable in the 1 in 12" test rifle. 2) We wanted a bullet with good accuracy in the test rifle across a range of muzzle velocities. Prior work with this bullet demonstrated this. 3) We wanted a bullet that had excellent shot to shot consistency with drag/BC determinations. A lot of other bullets have significantly larger shot to shot variations in drag/BC than this one. The differences in drag we observed were not too much smaller than the uncertainties in drag. A bullet with larger shot to shot variations in drag would mask the effect we were hoping to observe. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Chatting and General Stuff
General Discussion
Do Bullets Go To Sleep?
Top