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Over the course of about 25 years and numerous discussions in the pits at Perry, the concensus has been that for service rifle competition, either a 1:7 or 1:8 barrel is a necessity in order to be competitive at the 600 yard line. For me, a 1:9 barrel just can't be competitive beyond the 300 yard line.
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This is the closest thing I've seen to proof regarding this issue. Did you see for yourself that a 1:9 wasn't competitive at 600 yards? Sometimes consensus is wrong but usually not especially at Perry.
FWIW I have a 1:9 .223 varmint rifle. It will shoot a 5" group at 500 yards consistently with my best group at that distance being 1". But it's not an AR obviously. It has a 26" barrel. I shoot 75 gr bullets (Sierra boat tail in Black Hills Remanufactured Ammo cartridges). They are pretty consistent for off the shelf ammo. So it is possible for a 1:9 twist to shoot well but again it isn't a service rifle.