Okie,
I'm right there with ya'! I load 28.0 grains of W748 with 50 grain BTips or Blitzkings and the accuracy is always at .5" give or take a few thousanths.
I'm just now trying H225 and BLC-2 with the .223 for comparison. BLC-2 is very good. Just bought a pound of H335 and loaded 'em up the other night. Gotta see how the 335 does before I decide on a pet .223 load.
By the way, you're target groups are excellent!!!
Nice shooting.