Quoted: Ammo Oracle also makes an interesting point that the faster twist bbls may also provide enhanced fragmentation with M193 due to the extra fast rotation of the bullet in the 1-7 bbls vs. 1-9 or 1-12.

Show me where the Oracle says that.

Quoted: Quoted: Ammo Oracle also makes an interesting point that the faster twist bbls may also provide enhanced fragmentation with M193 due to the extra fast rotation of the bullet in the 1-7 bbls vs. 1-9 or 1-12.   Show me where the Oracle says that.

+1


-------------------

www.ammo-oracle.com/body.htm#m193acc

Q. Will M193 be accurate in a 1:7 or 1:9 twist barrel?

It may be marginally less accurate due to the fast twist rate, particularly in 1:7 twist barrels.  Unless you're trying to use these rounds for benchrest shooting, though, it shouldn't be enough to matter.

A bullet's flight is disrupted slightly as it leaves the barrel and after traveling some distance, will "settle down" into an even spiral, similar to a thrown football.  The faster a bullet is spinning, the longer it takes to settle down.  The most accurate twist rate for any length of bullet will be just a bit faster than what is required to stabilize it for its entire flight path (1.3 SG).  But note that bullet quality plays a much bigger part in this equation.  A uniform bullet will spin true; a non-uniform bullet will wobble and be inaccurate.  As a general matter when shooting M193 or M855 (as opposed to match ammo) its better to err on the side of a faster twist rate.  Regardless, both 1:9 and 1:7 twists seem to shoot M193 and M855 very well.

--------------------

-Troy

-Troy