dubb-1 is pretty much right on it with the rounds. The optimal twist is a 1/7. The tighter the twist the more accurate your shoot will be (provided you can shoot).
The more travel time the projectile spends on the lands and grooves as it leaves the chamber to reach its maximum vel, the better control the round will have after it exits to a "free-flying mode". Stability leads to accuracy.
You are able to fire lighter grains out of a faster twist to a reasonable distance, but you cannot go the other way. The heavier grains will exit, and not to far past 45-60 yrds it will start to yaw, then tumble. Soon the projectile will lose so much velocity it will soon crash to the ground.
I hope I made sense.. At least this is the way I understand it.
Brett W
Elite Defense
Vice President of Domestic Sales and Marketing
FN Senior Manager of Assault Weapons - SCAR Program 2006-2010
Former Troy Industries Inc Director of Operations 2003-2006
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