My Hornady 3rd Edition 3rd printing, (1981/1982) had 12 twist for their 223 and from what I can find the 12 twist was standard for the 223.
Of course tighter for military applications and heavier projectiles.
Thinking more about this I seem to remember chatter of the 60 grain Partition not stabilizing in a 22-250 with 14 twist. May be because not enough twist or guys not loading them hot and a Partition seems to like some gas underneath of it.
The Speer is a little longer but some stuff I have found, and the 222 my pard had they seem to shoot. I guess it's one of those have to try it to see if they will shoot.
Last edited by 10gaugemag; 07/15/22.
