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The Ruger American Rifle .223 has actually a 1:8 RH barrel Twist.
Go to the Ruger website & Check.
Dan at Reloaders advertised these two days ago and listed them with a 1:10 twist.
I pointed this...

I have put my name down for one of the Ruger American Rifle .223 Compact - These have a 1:8 RH Twist.
ReLoaders website had it listed as a 1:10 twist and when I checked with Dan he said he had...