I reload for five other .223s, so when my Handi 1 in 12 would not shoot the load I got rid of that barrel. I could probably found a load that would have worked with it, but I just did not feel like messing with it. My H&R Ultra, shoots this load very well. So do my Mini-14s and my T/Cs.
I use the Factory Duplication loads listed in the Hodgeden powder manual. Here is one that might work well for you, I did not use it with my .223 barrel, was not loading it at the time. I get real good results with both of these loads, the second one is the one I was loading before.
Winchester Case, Winchester WSR Primer, Winchester 748 Powder 25.5grs, 50gr bullet.
Winchester Case, Winchester WSR Primer, Winchester 748 Powder 26grs, 60gr bullet.
The manual does not specify what bullet, just the weight. They list one powder weight for each bullet weight period.