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Any 55gr projectile data gives you a starting point.
Start low or in the middle of the range suggested and work your way up.

The ADI data is for their test configuration which probably doesn't...

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...