Originally Posted by
Oldtimr
Capt, the twist rate is caused by the rifling so the weight of the bullet has no bearing on it.
As I understand it, heavier bullets need a faster twist rate to stabilize. A few tests have been done and documented showing heavy bullets failing to stabilize if not spun fast enough. Lots of variables though....
With that, I have a .308 with a 1:12 twist and it doesn't like anything beyond 168 grains except for the 178 ELD-X. Every other 180 is 4+" groups at 100 yards where it's well under 1 MOA at that range with lighter bullets.