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I will agree with the above post, with one caveat, it is perfectly ok to use regular (non-tracer) 62-grain bullets in 1-in-9" twist, but the US military 62-grain tracer round and any heavier rounds may not stabilize in this twist rate. Most commercial production .223 rifles come in 1-in-9" now in order to allow acccurate handling of the SS109 62-grain bullet.
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