An 8 twist just over spins the bullets and you give up a little velocity, a little accuracy and a lot of bullet integrity.
Believe what you want, but that sure hasn't been my experience. One of the most accurate 223 loads I use is the 50gr SP varmint bullets from Midsouth, in a 1:8 barrel.
It's not 1985 any more, we have better bullets now.
