lee 308-230 subsonic in the bo

[Lloyd Smale]

This will be a ruger American not an ar I have to worry about function with. How slow can I go before I loose stability with this bullet.

[Lloyd Smale]

well I found out that 3.5 grains of red dot is quiet. It at least puts holes in the snow.

[JimB..]

You should have plenty of snow to shoot at today!

Ever look at Don Miller’s work on your question? https://www.accurateshooter.com/technical-articles/calculating-bullet-rpm-spin-rates-stability/

[charlie b]

I assume that it will have the 1:7 twist. If so the simplified stability calculators say it will be stable down to 500fps. Keep in mind that these calculators are designed for supersonic bullets so may not be that accurate at subsonic. Lee website says the bullet is 1.36" long.

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi

[Lloyd Smale]

thanks Charlie!
I assume that it will have the 1:7 twist. If so the simplified stability calculators say it will be stable down to 500fps. Keep in mind that these calculators are designed for supersonic bullets so may not be that accurate at subsonic. Lee website says the bullet is 1.36" long.

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi

[charlie b]

You're welcome. I just hope the formula works for you ;)