Nice piece. The 1/7 twist means you can use long for caliber bullets like Barnes and some others so you have better terminal ballistics under 400 yards.
If you are looking at distances over 400 yards than you can use heavier bullets.
I need to look through my notes. Several years ago I was rolling my own and testing velocities with heavy and long for caliber bullets. I think at that time I didn’t have anything tighter than a 1/9 twist though.