What happens to the spin of the bullet. Does it slow down range with velocity reduction?

spin actually remains relatively constant.

When the spin slow down the round starts to drift or wobble either way you know on the target.I think that you see more when it pass thru the sound barrier the second time.

The "wobble" is actually caused because spin stays nearly constant (Law of Conservation of Rotational Momentum) while linear momentum rapidly degrades.

quote:

Originally posted by 7mmfreak:
The "wobble" is actually caused because spin stays nearly constant (Law of Conservation of Rotational Momentum) while linear momentum rapidly degrades.

What would happen if you made a custom barrel say, starting at the breach with a 1 in 6 twist, ending at the muzzle with say 1 in 13 twist, would the "forced slowing of spin" improve longer range stability?

???????

quote:

Originally posted by wino:

quote:

Originally posted by 7mmfreak:
The "wobble" is actually caused because spin stays nearly constant (Law of Conservation of Rotational Momentum) while linear momentum rapidly degrades.

What would happen if you made a custom barrel say, starting at the breach with a 1 in 6 twist, ending at the muzzle with say 1 in 13 twist, would the "forced slowing of spin" improve longer range stability?

huh?????????????????????????????????????


the 2nd amendment is NOT about hunting.............

Decelleration of the bullet will stop when the bullet leaves the barrel. The bullet will continue to spin at the last twist rate (relatively) in the barrel.

I have a gain twist barrel and I'm sure that my bullets don't continue to gain RPM after the bullet leaves the barrel.

quote:

Originally posted by wino:
What would happen if you made a custom barrel say, starting at the breach with a 1 in 6 twist, ending at the muzzle with say 1 in 13 twist, would the "forced slowing of spin" improve longer range stability?

I don't know of anyone who makes barrels like that. You can get gain twist. I would be inclined to go from 1-18 to 1-13 rather than from 1-6 to 1-13. I personally wonder what gain twist does to jackets (or loss twist as you propose) and how it affects drag. I know it has been around for more than a century so there are obviously those who believe in the idea.

Wino, a declining twist barrel will not produce a balanced bullet in flight. One of the barrel makers has a write up on it, I don't remember which one, but if I remember correctly, it's one that produces rifle cut barrels, because they would have the equipement to produce them. In essence they said twist must be constant, or increasing to produce a stable bullet, but their testing did not show any accuracy benefits to an increasing twist barrel, and recommended constant twist barrels.