Looking on the ADI website Data – Rifle – ADI World Class Powders and Ammunition for a .223 with a 55 gr projectile there was a Benchmark 2 load listed.
Start low and work your way up.
When I was loading for a .223 with 2208 my load was higher than the recommended ADI max (for an 80gr projectile) but it was safe and competitive in my rifle - but I worked my way up to that load.
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