Just me, but for an all round .223 I wouldn't want under 20". 20" is the ideal for me (I have 2 20", and a 22"). The folk with shorter barrels always seem to be chasing velocity. My theoretical minimum is 3 K for a 69 grain projectile (that is achievable in some 18" but you never know until you have made the cut). But all of that is just me.
Ive also gravitated towards faster twist barrels so I can use heavier for caliber projectiles. The 80 grain are something else for bucking wind and knocking over, but require a 1:8 barrel.
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