Spooner wrote:Yup, .223 is usually something like 1:9 twist.
.222 is usually something 1:14 twist.
That's "usual" though. Will change with different rifles obviously...
Unless it's a Custom Barrel the common twist rates are:-
1:14 for .222R
1:12 for .223R
some .223R like CZ Varmints are 1:9 and some others like Tikka T3 / Sako offer an optional 1:8 twist on request/order.
The faster twist rates do not necessarily restrict you to the heavier weight bullets. My CZ 527 1:9" Twist shoots Barnes 36gr Varmint Grenades extremely accurately and the velocity is fast.....!!!!
There are obviously certain weight and shape bullets that perform the best for each twist rate. The drama is finding it for what you have and even if the twist rate is the same between firearms it doesn't mean each will like the same weight bullet. Just as each may prefer a different powder / load / bullet combination.
If you are buying a new or secondhand .223R you should check the Twist Rate which in most cases should be stamped on the barrel or you might end up with something you didn't plan on.
The fun part of modern day firearms.