-Friend has a former 223 1 in 9 twist barrel that he chambered for the swift shooting 69 grain sierra bullets. Very accurate to 400 yards. Also accurate out to 800 yards if wind not too strong.
Once wind came up he had trouble hitting the gong at 800 due to wind drift. My 6mm AI with 105 grain bullets handled the wind much better. I would expect an 8 twist barrel and 80 grain bullets would solve the drift problem in the swift.
