Opinions on most accurate barrels in 223. JP, Noveske, etc?

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Let's not forget the rainier ultra match barrels. My 18" intermediate shoots unbelievably well!!!

My Rainier Ultramatch 18" intermediate is sub MOA for match ammo and MOA for NATO type ammo at 100 yds. I like the company. They stand behind their claims. It's easy for me to hit 600 yard 10" targets with 77gr match ammo. I haven't tried further yet.