What would be the idea twist for a 16 inch colt sporter pre band? It has a light weight 1-7 that I was going to change to a m4 style. Should I stay with 1-7 or go to 1-9? Any thoughts
:hmmm: :assult:Logansdad said:I was told that the Viet Nam round was a 70 grain bullet exiting a 20 inch barrel with a 1 turn in 12 or 14 inch twist rate. I was also told that the SS109 round is a 62 grainer optimized for a 20 inch barrel with a 1 turn in 7 inch twist rate. I was also told that the 55 grain projectile was optimal for a 1 turn in 9 inch twist and what the Military was going to standardize upon for regular line troops.
What is the real story ?