How much spin before sabot exits?

[tpcollins]

My understanding of how a sabot works is, the hollow base section expands into the rifling from the pressure created by the black power expolsion as it travels down the barrel. My Knight has a 1:28" twist and I have around 21" of barrel ahead of the sabot. Therefore the most the sabot could spin would be 3/4 of a turn before it exited the muzzle. It would make sense to think that the sabot might travel straight some amount of distance before it started to spin.

Two questions:
- does anyone know how soon a sabot starts to spin?
- how much spin is required to effectively stabilize the sabot?

Thanks.

[whyohe]

the sabot spin starts as soon as it hits the rifling wich is usually at the start. the sabots now days are tough enough not to slip in the rifling.and the fit should be tight enough that the petals grab the rifling and the bullet so both spin at same time with minimal to no slip between the bullet and sabot.

the sabot does not need stabilizing. the bullet does and that is why you should have a snug to tight fit. if you go to the relaoding section there is a post that brings up this very question on bullet stabilization you might like. it has a referance to a mathmatical equasion to figure that out.