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What is this I hear about the rifling twist, 1 in 9 ect... what do those numbers mean?

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Rifling causes the bullet to spin. The rate the bullet spins depends on the twist rate.

If a barrel has a 1 in 9 twist, this means the bullet will make one complete revolution as it travels nine inches down the barrel. The faster the rate 1 in 7 the heavier a bullet it will stabilize. The slower ther rate 1 in 14, the lighter the bullet.

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With that said why don't they just make all barrels with a twist to make bullets spin very fast?

What are the disadvantages to spinning fast? Or a lighter bullet spinning very fast?

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I believe too high of a spin rate for a lighter bullet will destabilize it.

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Remember when you were a kid and you played with a top. If you spun it too fast it wobbled until it slowed down and stabilized. Then when it slowed down further it became unstable and started to wobble again. Bullets do the same thing.

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With that said why don't they just make all barrels with a twist to make bullets spin very fast?

What are the disadvantages to spinning fast? Or a lighter bullet spinning very fast?

To stabolize a bullet, the longer the bullet the faster it must be spun. So round balls can be very stable with a twist of one turn in 66 inches. Long, moderm bullets require a fast twist. Thus when the M-16 bullet was made longer and heavier (to increase it's down range effectiveness) the twist was speeded up from 1 in 9 inches to 1 in 7 inches.

You can get pretty good accracy shooting the old, shorter bullets in the newer rifle with a faster twise; however, you will not get good accracy by shooting the heavier and longer bullete in the older rifles with the slower twist.

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