1 in 12 twist 223

[Jedabug92]

causing such a gyroscopic effect that the bullet begins to curve under the force of the effect. Neither are very likely.

So it is spinning so fast the bullet begins to warp under the force of said spin?

 

[aviator41]

The bullet doesn't warp, the trajectory does. Think of it like a curve ball. same basic concept.

 

[dennishoddy]

The 1n12 is best suited for the 45 grain varmint bullet.

 

[Jedabug92]

The bullet doesn't warp, the trajectory does. Think of it like a curve ball. same basic concept.

So you CAN curve a bullets trajectory! Haha

 

[aviator41]

I would agree. things being what they are, the 55grs seem to be more attainable, at least for now and it's a round that will group fairly well.

 

[dennishoddy]

This link will answer every question you have.

http://www.riflebarrels.com/articles/bullets_ballastics/bullet_imbalance_twist.htm

 

[Boehlertaught]

Aviator41 and others are spot on with the twist rate info. We all talk about the fast vs slow twist rates and how they affect heavy to light bullets, respectfully. But what the twist rates actually, directly, affect is the length of the bullets. Certainly longer bullets are typically heavier than short bullets...but maybe not when you compare old style copper clad lead bullets to the new bullet designs such as solid copper or frangible bullets.

 

[okietom]

Reloading articles and ballistics articles and manuals are good sources for barrel twist rate information.

The first AR's had 1 in 12 twist rates that were for the 55gr bullets that they used.

 

[KurtM]

I'm pretty sure that the first M-16,s had a 1x14" twist rate and that was subsequently tightened up to 1x12" in the M16-A1.

 

[CAR-AR-M16]

I'm pretty sure that the first M-16,s had a 1x14" twist rate and that was subsequently tightened up to 1x12" in the M16-A1.

You are correct. The very first M16's had 1/14 twist. Later M16's and all M16A1's had 1/12 twist. Current M16A2, M16A3, M16A4, M4 and M4A1 have 1/7 twist.