240gr SMK

[trueblue]

Could someone measure the oal of a 30cal 240gr SMK for me. I would like to run a calc on twist required for a barrelto stabilize this bullet. Also want to know what the SF is on a 240gr at 3000fps in a 9.5 twist.
Thanks,
JIM

 

[jmden]

Could someone measure the oal of a 30cal 240gr SMK for me. I would like to run a calc on twist required for a barrelto stabilize this bullet. Also want to know what the SF is on a 240gr at 3000fps in a 9.5 twist.
Thanks,
JIM

1.582 give or take, depending on the meplat

 

[trueblue]

Thanks,jmden

 

[Autorotate]

1.600 according to QL and Loadbase libraries. Mine measure up about like JMDENs do.

Loadbase calculator using the Miller formula says you get a SF of 1.82 @ 3000 fps and a 9.5 twist.

Informative post by Bryan @ Berger regarding twist rates and the math behind them.
Question: twist rate for .338 bullets - Sniper's Hide Forums

 

[trueblue]

I came up with a similar SF with the help of the software Michael sent me.
Good to know .