Recommend 223 Powders.

Benchmark and varget worked well for me. Both in a 1:9 Savage barrel too. Was using benchmark for the light 40g Noslers and Vmax. Varget for 69g SMKs and 77g Amax.
 
I've been using Benchmark and Varget for my .223 mostly because I had a bunch on hand. Both have worked very well for me in a 1-10" twist barrel using 60-62 gr pills.
 
I use Varget, but since it is in a Ruger Mini-14 and the gun shoots one-foot groups on a good day, I think I could get away with using ground up match heads and achieve the same results :)

Seriously, N540 is a a Cadillac 223 powder
 
I would say your on right track with powder you got, my 223 didn't like Varget. I am sure that I used Bench Mark.
 
I have had good luck with Varget and h4895. I know h335 works well, but I don't use it as it is not an extreme powder. With Benchmark my groups look more like a shotgun pattern.
 
You answered your own question! Varget and/or Benchmark. My 223's have always liked 26gr Varget with a 65 or 69gr bullet, Hornady or Sierra.
 
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