I was able to find some 50g Nosler .224 Varmint rounds for a decent price. Has anybody loaded these for a .223 with a 1:9 twist barrel? The only powders I have are BLC2 and H322. These powders have worked well with 55g Nosler Varmagaddens.
I shoot a 9 twist in a .223. There are a variety of powders that work very well in it. IMR 3031, Benchmark, varget, W748, as well as several other already listed. Check out some manuals. You will be surprised.
H-322 is what the bench rest shooters used in the 222 Remington and others. It will work fine as long as you aren't worried about squeezing every last FPS out of the load.