In my somewhat limited expierance with the 69gr SMK's in a 223Rem chamber,1:8 twist . . . the accuracy was dependent on the seating depth (how far off the lands).
I finally got the combo to shoot <MOA and as much as I can remember was about .800-.875" @ 100yds. I do remember that I had to move the bullet as fast as possible though.
I'm sure that there are more people around with better knowledge of this combo. --- SAWMAN