View Full Version : Optimun /desired twist for a .224 bullet .666" long
Wayne S
09-17-2013, 11:17 AM
Looking for thoughts and opinions on the optimum twist to shoot .666" long .225 bullets at between 1750 & 1850 FPS
?????
Tom Myers
09-17-2013, 01:21 PM
Looking for thoughts and opinions on the optimum twist to shoot .666" long .225 bullets at between 1750 & 1850 FPS
?????
This should get you started.
Calculate Optimum Twist Rate (http://www.tmtpages.com/twistrate.htm)
Wayne S
09-17-2013, 02:07 PM
Tom,
Thanks, JBM is another one I use http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
When talking to gun smiths & T/C custom barrel makers , say "cast bullets" and you can image their eyes glazing over and rolling back in their head.
Larry Gibson
09-17-2013, 04:03 PM
The optimum will be the slowest twist that just stabilizes the cast bullet across the expect range of use...
Larry Gibson
swheeler
09-17-2013, 05:14 PM
Looking for thoughts and opinions on the optimum twist to shoot .666" long .225 bullets at between 1750 & 1850 FPS
?????
666 that's going to be a devil to get to shoot! I'd use a 1:11 twist for your velocity
Wayne S
09-17-2013, 05:46 PM
The only trouble is no one makes a 1-11 as a standard item, plus while one program says a 1-12 is in the middle of the stability range, the other say's it would take 2000+ fps to stabilize the .666 " bullet.
Powered by vBulletin® Version 4.2.5 Copyright © 2024 vBulletin Solutions Inc. All rights reserved.