re: Pistol powder for small rifle cartridges

For 223, look at James Calhoon website and start with his articles "To Bee or 223, That is the Question" and there is a second "revisited" page. With Blue Dot and 800x there is a lot of data out there, but he was one of the first. You can essentially produce 22LR, 22 magnum, all the way to full power loads.