[fso301]

Furthermore, a lower ratio means an increased speed, so a twist rate of 1:7 will travel faster than one at 1:9, because it will complete a full rotation in only 7 inches compared to 9

I assume he means speed of rotation.

[Elderberry]

Miller twist rule is a mathematical formula created by Don Miller to calculate the optimum rate of twist for a given bullet traveling through a rifled barrel.[1] Miller suggests that while Greenhill's formula works well there are better and more precise ways to calculate what the proper twist rate for a bullet should be that are not much more difficult to calculate.

https://en.wikipedia.org/wiki/Miller_twist_rule

[Does so]

Then, there’s “Gain-Twist”...

[TexasTransplant]

Varmit Dave?