I had a factory Rem 700 Varmint in .223 and it was 1:13" twist. Ok as long as you shoot 55 grainers or lighter and, as Spanners already said, flat-base are good. I used the hornady 53 grain match bullets and they were very good. To fling heavier 22 cal pills, you need 1:7" to 1:9" twist.
Ray.
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