Trimming .223 Brass for an AR-15
I have only used H335 with great results so far with 55 grain bullets. I have several pounds of AA2230 and 748 but haven't been motivated to try them yet.
If you are using magnum primers, be sure to work up. Pressures can vary with the hotter primers.
I have had good results with standard Winchester and CCI primers. I've used the magnums but didn't see better results in my situation. I suspect the Winchester primers, in particular, are designed for ball powders.
It's interesting that there is more interest in using AA2230 now. Six months ago I asked for advice for using the powder and few were using it on the major forums.