Tried that years ago, before learning that the smaller the diameter of a cast bullet, the harder it seems to get good accuracy. After casting and loading a variety of combinations for the .223, it was off to the range. They all shot like crap. With only a handful left, I wanted to kill something with them. Missed a bunch of small critters, finally caught a gopher sitting on a big rock...shot the rock, and got him. That was the end of my experimenting.
