5.56mm chamber 1-7" twist. Wylde chamber was built for shooting 80 grain bullets for National match work. An AR pistol and National Match don't belong in the same sentence, much less the same chamber.
And yes, count me as one who doesn't buy the 1-8 Twisted 223 Wylde Chamber as a some kind of magic potion for improved AR accuracy in all configuration's.
However, If your goal is long range shooting with a heavy barreled AR, then yes, the Wylde chamber does offer some improvement's over the normal 5.56mm chamber, if the shooter is skilled enough to use it.
But barrel makers are putting Wylde chambers in every manner of AR barrels, and not necessary match grade barrels, and the savants are buying them thinking they'll get a some sort of huge accuracy improvement over a standard 5.56mm chamber.
Further, the case has been made that all 223 Wylde chambers are safe with all 5.56mm loads. But if your loading hot, like IMI Razor Core hot, many have experienced popped primers with Wylde chambered rifles. And it stands to reason the 5.56 chamber is larger then the Wylde (the Wylde Freebore is longer but narrower than the 5.56mm).
In short, except for ultimate accuracy with premium match grade barrels, chambered by known makers of accurate barrels, stick to 5.56mm chambers and 1-8 or 1-7 twists.
