It’s 1.7 twist. 1:9 was not an option in the Axis II Precision. All three powders will work. BLC-2 is my personal favorite for 223/5.56. Between those two bullets, the 77 Match Kings are the winner imo. But the 69gr pills will shoot great with a worked up load. It’s 223. Super easy, very forgiving and incredibly versatile. Honestly why I don’t understand all these fad calibers in the AR. But I digress. 223 is one of my MUST HAVE cartridges.
It’s hard to find exact info on specific bullet/powder load charges which aren’t published. And for good reason! KABOOM! I can tell you the H335 & 2460 are closer in burn rate, a good bit faster than BLC-2. Not the best for heavy pills. I don’t think either is great for the 77’s, but the BLC-2 is fine. All three powders are ok with the 69gr’s. Looking at something like 20gr starting loads with the 335 & 2460, & maybe 22gr starting loads with the BLC-2. Maybe a little more on either, but always good to start low & work up. When you start way low, you are safe AND, it affords you the full range of each powder for a given weight bullet.
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