K.I.S.S. Use bullets that fit your gun. Use starting loads from your Lyman manuals (either the 50th or Cast Bullet Handbook). If you purchase bullets, make sure they are the diameter you need. This will get you started safely and cleanly.

Some commercial cast bullets are shipped with near worthless lube, so maybe a quick dip in thinned alox will be need, after you have tried them and find a need...

There is so much to learn about your guns when shooting cast bullets you'd never realize when just shooting jacketed or factory fodder. And that's a good thing...