As has been eluded to here, twist rate is a personal thing and should be dictated by the bullet you want to use. In 223 I prefer lighter bullets and have 2 custom - 223 barrels that are 1 - 14" twist on Stevens actions. I also have a Handi barrel in 1 -12" twist. The 1 - 14" do great on bullets 50 grains and lighter. The old school said to not over stabilize a bullet, in other words do not use a faster twist than needed. This was because (I believe) bullet quality was not as good in the old days as now. If you have an imperfect bullet and it spins faster than needed to stabilize, it would take erratic bullet paths causing accuracy problems. Now days, the bullets from the major manufacturers are much better in the quality department, so over stabilization is not the problem it once was. I have just built a 22 BR with a 1-8" twist rate. My goal is to shoot VLD bullets 75 - 80 grains. Bottom line, if you are not sure what bullet weight you are going to shoot, get the faster twist rate, chances are it will shoot light bullets acceptably well and shoot the heavier ones well. If you are going to shoot heavy bullets get a fast enough twist rate to handle them and if you know you are only going to shoot lighter bullets, get a slower twist barrel. Good Luck and Good Shooting