Amidoinitrite? Started at 10% below max listed and went up 2% each time until max, which yielded 6 stages and at 5 rounds per stage, gets us 30 rounds. Will follow up with results (Ruger SR556).
I will be curious to see what your results are. H335 is my favorite powder for .223Rem. What weight bullet are you using?
I just made a horrifying discovery in my reloading room....what I thought was a full 8lb keg of H335 was actually over half empty. I will now have to join the unwashed masses looking for powder. [sad2]