I don't load for the 204 Ruger but a shooting buddy does. He swears by IMR-8208 XBR but if you already have Benchmark they are similar powders. If you can get a hold of some IMR-8208 give it a try.
When then .204 came out the limited available loading data gave BL-C(2) the highest velocity (not usually my main goal but the .204 is kinda about velocity after all). Data was also limited and newer powders are available so that may not still be the case. Anyway it also gave me excellent accuracy and at the time I couldn't beat it with anything else so it's what I still use. That was probably 10+ years ago and I have not tried any of the newer powders though.
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