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1:8" twist is pretty tight for a 223. I would recommend you go with heavier pills if they suit your purpose. I have had great accuracy results with the 69gr SMKs but i don't hunt with them. For a hunting projectile the Sierra 63gr SP projectiles are awesome. Both Malcolm and I are running those projectiles and have shot a fair few reds with them over the years.
What twist barrel are you running the 63 grainers in Gillie because thats what i am thinking of using as they work well in my 22-250 in the 1/12 twist
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