1:8 twist. Do yourself a favour and run some drop charts on a lighter bullets and some heavier bullets. You will soon realise there is not much in way of drop, but wind drift (the one thing that kills a 223 with the wrong bullet) is less with the heavier bullets. My solution is 1:8 twist running 80gr EldM at 2840fps, out of longer mags, with holdover reticle and bracketing.
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