Mine has a one in 7 twist... but I know that a 1 in 8 twist 223 will stabilize both the 73 and 75 grain plastic
tipped bullets.....I've also shot quite a few 80 grain A Maxes in mine....it and the 75 BTHP are the two most accurate bullets in mine, over 70 grains.

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez