Awf Hand,
22 Hornet is 1 in 12.
Other twist rates are listed in the FAQ that is a sticky at the top of the forum.
The 223 is 1 in 12 also and it does fine with the 55 grain bullets. Speed and bullets dimensions have more to do with it then weight. Some of the group have had fair success with, I believe, a 60 grain Winchester flat base in the 223 Remington.
Neal