Quote Originally Posted by sarge4318 View Post
Actually the twist has to match the bullet. The longer the bullet the faster the twist needs to be - a short bullet should work in a fast twist barrel.

A longer/heavier bullet (depending upon which formula you use) will require a faster twist. With .223 there are lots of scare stories about over stabilising the bullets, but how stable do you want them?
Spinning too fast could potentially disintegrate the bullet but I have never heard of any first hand stories of it happening with bullets fired at normal .223 speeds. I regularly shoot 52gn bullets from a 1:7" twist travelling at breakneck speeds and the foxes don't know any different.

The upshot is faster twist is better, unless you're wildcatting and pushing the envelope regarding pressures and velocities.
With the 1:8" twist rate you should be able to shoot the heavy 75/77gn bullets and possibly even the 80gns but you'll have to try it and see what your barrel limits are.
That's interesting, so a 55grn bullet will still be accurate in a faster barrel, but a heavy bullet needs a fast barrel to be accurate. That is good news as the 55grn are far cheaper