I have a .223wssm that I was thinking about building. I was thinking about pushing some 69- 75 grain bullets with it. Now about what kind of velocities and accuracy would you expect from this cartridge with these heavier bullets. The gun that I will be starting with is a Winchester shadow. I was thinking of a 30" 1in. dia. heavy bull barrel prolly with a 1-9" twist?,what twist rate would you guys use?) also I dont know what barrel manufacturer would you use? A nice thumbhole stock that will be glass bedded. I was also going to send the action out and have it trued up and a trigger job. So what do you guys think of this? Good, bad, or what?