I also have the 26" 1-9" twist in 223 and mine seems to like RL15 and 55gr V-Max. It also has shown promise with a 55gr Hornady SP-SX and Varget. Varget also did pretty well with the V-Max, I had just made a switch to RL15 when varget got so scarce a couple years back and haven't switched back.
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